diff --git a/README.md b/README.md
index 964b6c9..e7dc09c 100644
--- a/README.md
+++ b/README.md
@@ -38,6 +38,7 @@ The most advanced auction house addOn for the 1.12 client with some features mor
 * Sorting across all scanned pages.
 * Quick buying from any page without rescanning everything.
 * Real time mode which continuously scans the last page.
+* Purchase summary window to track gold spent during a session.
 
 ### Post
 * Automatic assembling and posting of multiple stacks.
@@ -67,6 +68,7 @@ The most advanced auction house addOn for the 1.12 client with some features mor
 **/aux post duration _hours_** (Sets the default auction duration to _2_/_8_/_24_ hours)<br/>
 **/aux sharing** (Enable or disable auction data sharing as described above)<br/>
 **/aux theme** (Switch between the two themes)<br/>
+**/aux purchase summary** (Toggles the purchase summary window that tracks gold spending)<br/>
 ### Tooltip
 **/aux tooltip value**<br/>
 **/aux tooltip daily**<br/>
diff --git a/aux-addon.lua b/aux-addon.lua
index a63dae2..2c7ea7a 100644
--- a/aux-addon.lua
+++ b/aux-addon.lua
@@ -3,6 +3,7 @@ module 'aux'
 local T = require 'T'
 local post = require 'aux.tabs.post'
 local gui = require 'aux.gui'
+local purchase_summary = require 'aux.util.purchase_summary'
 
 M.print = T.vararg-function(arg)
 	DEFAULT_CHAT_FRAME:AddMessage(LIGHTYELLOW_FONT_COLOR_CODE .. '<aux> ' .. join(map(arg, tostring), ' '))
@@ -68,6 +69,7 @@ function handle.LOAD()
         post_duration = post.DURATION_24,
 		post_stack = true,
 	undercut = true,
+        purchase_summary = true,
         items = {},
         item_ids = {},
         auctionable_items = {},
@@ -162,7 +164,13 @@ do
 		if money >= amount then
 			locked = true
 			local send_signal, signal_received = signal()
+			local name, texture, count, _, _, _, _, _, buyout_price = GetAuctionItemInfo(type, index)
 			thread(when, signal_received, function()
+				-- Track all (buyout) purchases after successful bid
+				if name and amount > 0 and amount >= buyout_price then
+					purchase_summary.add_purchase(name, texture, count, amount)
+					purchase_summary.update_display()
+				end
 				do (on_success or pass)() end
 				locked = false
 			end)
diff --git a/aux-addon.toc b/aux-addon.toc
index 67a58e0..93bae1d 100644
--- a/aux-addon.toc
+++ b/aux-addon.toc
@@ -35,6 +35,7 @@ core\shortcut.lua
 gui\listing.lua
 gui\auction_listing.lua
 gui\item_listing.lua
+gui\purchase_summary.lua
 
 tabs\search\core.lua
 tabs\search\results.lua
diff --git a/core/slash.lua b/core/slash.lua
index cb3978c..406db4d 100644
--- a/core/slash.lua
+++ b/core/slash.lua
@@ -4,6 +4,7 @@ local T = require 'T'
 local aux = require 'aux'
 local info = require 'aux.util.info'
 local post = require 'aux.tabs.post'
+local purchase_summary = require 'aux.util.purchase_summary'
 
 function status(enabled)
 	return (enabled and aux.color.green'on' or aux.color.red'off')
@@ -76,6 +77,13 @@ function SlashCmdList.AUX(command)
 	elseif arguments[1] == 'show' and arguments[2] == 'hidden' then
 		aux.account_data.showhidden = not aux.account_data.showhidden
 		aux.print('show hidden ' .. status(aux.account_data.showhidden))
+	elseif arguments[1] == 'purchase' and arguments[2] == 'summary' then
+		aux.account_data.purchase_summary = not aux.account_data.purchase_summary
+		aux.print('purchase summary ' .. status(aux.account_data.purchase_summary))
+		-- Hide the frame if disabled
+		if not aux.account_data.purchase_summary then
+			purchase_summary.hide()
+		end
 	else
 		aux.print('Usage:')
 		aux.print('- scale [' .. aux.color.blue(aux.account_data.scale) .. ']')
@@ -97,5 +105,6 @@ function SlashCmdList.AUX(command)
         aux.print('- theme [' .. aux.color[aux.account_data.theme == 'blizzard' and 'green' or 'red']('blizzard') .. ' | ' .. 
             aux.color[aux.account_data.theme == 'modern' and 'green' or 'red']('modern') .. ']')
 		aux.print('- show hidden [' .. status(aux.account_data.showhidden) .. ']')
+		aux.print('- purchase summary [' .. status(aux.account_data.purchase_summary) .. ']')
     end
 end
diff --git a/gui/purchase_summary.lua b/gui/purchase_summary.lua
new file mode 100644
index 0000000..d75ad38
--- /dev/null
+++ b/gui/purchase_summary.lua
@@ -0,0 +1,227 @@
+module 'aux.util.purchase_summary'
+
+local T = require 'T'
+local aux = require 'aux'
+local gui = require 'aux.gui'
+local money = require 'aux.util.money'
+
+-- Purchase summary data storage
+local purchase_summaries = {}
+
+-- Purchase summary display frame
+local purchase_summary_frame
+
+function M.get_summaries()
+	return purchase_summaries
+end
+
+function M.clear_summaries()
+	T.wipe(purchase_summaries)
+end
+
+function M.add_purchase(name, texture, quantity, cost)
+	if not name then return end
+
+	if not purchase_summaries[name] then
+		purchase_summaries[name] = {
+			item_name = name,
+			texture = texture or '',
+			total_quantity = 0,
+			total_cost = 0,
+			purchase_count = 0
+		}
+	end
+
+	purchase_summaries[name].total_quantity = purchase_summaries[name].total_quantity + (quantity or 0)
+	purchase_summaries[name].total_cost = purchase_summaries[name].total_cost + (cost or 0)
+	purchase_summaries[name].purchase_count = purchase_summaries[name].purchase_count + 1
+end
+
+function create_purchase_summary_frame()
+	if purchase_summary_frame then return purchase_summary_frame end
+
+	purchase_summary_frame = CreateFrame('Frame', 'AuxPurchaseSummary', UIParent)
+	purchase_summary_frame:SetWidth(300)
+	purchase_summary_frame:SetHeight(100)
+	-- Position differently based on theme
+	local y_offset = gui.is_blizzard() and 9 or -2
+	purchase_summary_frame:SetPoint('BOTTOM', aux.frame, 'TOP', 0, y_offset)
+	purchase_summary_frame:SetFrameLevel(aux.frame:GetFrameLevel())
+
+	-- Use aux's standard panel styling
+	gui.set_panel_style(purchase_summary_frame, 2, 2, 2, 2)
+	purchase_summary_frame:Hide()
+
+	-- Title text using aux color scheme
+	local title = purchase_summary_frame:CreateFontString(nil, 'OVERLAY', 'GameFontHighlight')
+	title:SetPoint('TOPLEFT', 8, -8)
+	title:SetText('Purchase Summary')
+	title:SetTextColor(aux.color.label.enabled())
+	purchase_summary_frame.title = title
+
+	-- Total spent amount aligned with cost column
+	local total_spent_text = purchase_summary_frame:CreateFontString(nil, 'OVERLAY', 'GameFontHighlight')
+	total_spent_text:SetPoint('TOPLEFT', 208, -8)  -- Same x as cost column (200 + 8 offset)
+	total_spent_text:SetWidth(80)
+	total_spent_text:SetJustifyH('RIGHT')
+	total_spent_text:SetTextColor(aux.color.label.enabled())
+	purchase_summary_frame.total_spent_text = total_spent_text
+
+	-- Column headers
+	local header_item = purchase_summary_frame:CreateFontString(nil, 'OVERLAY', 'GameFontNormalSmall')
+	header_item:SetPoint('TOPLEFT', title, 'BOTTOMLEFT', 0, -4)
+	header_item:SetWidth(150)
+	header_item:SetJustifyH('LEFT')
+	header_item:SetText('Item')
+	header_item:SetTextColor(aux.color.label.enabled())
+	purchase_summary_frame.header_item = header_item
+
+	local header_count = purchase_summary_frame:CreateFontString(nil, 'OVERLAY', 'GameFontNormalSmall')
+	header_count:SetPoint('LEFT', header_item, 'RIGHT', 5, 0)
+	header_count:SetWidth(40)
+	header_count:SetJustifyH('RIGHT')
+	header_count:SetText('Count')
+	header_count:SetTextColor(aux.color.label.enabled())
+	purchase_summary_frame.header_count = header_count
+
+	local header_cost = purchase_summary_frame:CreateFontString(nil, 'OVERLAY', 'GameFontNormalSmall')
+	header_cost:SetPoint('LEFT', header_count, 'RIGHT', 5, 0)
+	header_cost:SetWidth(80)
+	header_cost:SetJustifyH('RIGHT')
+	header_cost:SetText('Gold Spent')
+	header_cost:SetTextColor(aux.color.label.enabled())
+	purchase_summary_frame.header_cost = header_cost
+
+	-- Storage for row frames
+	purchase_summary_frame.rows = {}
+	return purchase_summary_frame
+end
+
+function M.update_display()
+	local frame = create_purchase_summary_frame()
+
+	-- Check if purchase summary is disabled
+	if not aux.account_data.purchase_summary then
+		frame:Hide()
+		return
+	end
+
+	if not purchase_summaries or aux.size(purchase_summaries) == 0 then
+		frame:Hide()
+		return
+	end
+
+	-- Calculate total spent across all purchases
+	local total_spent = 0
+	for item_name, summary in purchase_summaries do
+		total_spent = total_spent + (summary.total_cost or 0)
+	end
+
+	-- Update total spent display aligned with cost column
+	if total_spent > 0 then
+		-- Drop copper when displaying gold amounts (same logic as cost column)
+		local total_string
+		if total_spent >= 10000 then  -- 1 gold = 10000 copper
+			-- For gold amounts, round to silver and hide copper
+			local rounded_total = aux.round(total_spent / 100) * 100  -- Round to nearest silver
+			total_string = money.to_string(rounded_total, nil, true)
+		else
+			total_string = money.to_string(total_spent, nil, true)  -- Show full amount for smaller values
+		end
+		frame.total_spent_text:SetText(total_string)
+		frame.total_spent_text:Show()
+	else
+		frame.total_spent_text:Hide()
+	end
+
+	-- Clear existing row frames
+	for _, row in frame.rows do
+		row:Hide()
+	end
+
+	-- Create rows for each item
+	local row_count = 0
+	for item_name, summary in purchase_summaries do
+		row_count = row_count + 1
+
+		-- Create new row frame if needed
+		if not frame.rows[row_count] then
+			local row = CreateFrame('Frame', nil, frame)
+			row:SetHeight(14)
+			row:SetWidth(260)  -- Reduced width
+
+			-- Item name column
+			local item_text = row:CreateFontString(nil, 'OVERLAY', 'GameFontNormal')
+			item_text:SetPoint('TOPLEFT', row, 'TOPLEFT', 0, 0)
+			item_text:SetWidth(150)
+			item_text:SetJustifyH('LEFT')
+			item_text:SetTextColor(aux.color.text.enabled())
+			row.item_text = item_text
+
+			-- Count column
+			local count_text = row:CreateFontString(nil, 'OVERLAY', 'GameFontNormal')
+			count_text:SetPoint('TOPLEFT', row, 'TOPLEFT', 155, 0)  -- 150 + 5 spacing
+			count_text:SetWidth(40)
+			count_text:SetJustifyH('RIGHT')
+			count_text:SetTextColor(aux.color.text.enabled())
+			row.count_text = count_text
+
+			-- Cost column
+			local cost_text = row:CreateFontString(nil, 'OVERLAY', 'GameFontNormal')
+			cost_text:SetPoint('TOPLEFT', row, 'TOPLEFT', 200, 0)  -- 155 + 40 + 5 spacing
+			cost_text:SetWidth(80)
+			cost_text:SetJustifyH('RIGHT')
+			cost_text:SetTextColor(aux.color.text.enabled())
+			row.cost_text = cost_text
+
+			frame.rows[row_count] = row
+		end
+
+		local row = frame.rows[row_count]
+
+		-- Position the row relative to headers or previous row
+		if row_count == 1 then
+			row:SetPoint('TOPLEFT', frame.header_item, 'BOTTOMLEFT', 0, -2)
+		else
+			row:SetPoint('TOPLEFT', frame.rows[row_count - 1], 'BOTTOMLEFT', 0, 0)
+		end
+
+		-- Set the text content
+		row.item_text:SetText(item_name)
+		row.count_text:SetText(summary.total_quantity .. 'x')
+
+		-- Drop copper when displaying gold amounts
+		local cost = summary.total_cost or 0
+		local cost_string
+		if cost >= 10000 then  -- 1 gold = 10000 copper
+			-- For gold amounts, round to silver and hide copper
+			local rounded_cost = aux.round(cost / 100) * 100  -- Round to nearest silver
+			cost_string = money.to_string(rounded_cost, nil, true)
+		else
+			cost_string = money.to_string(cost, nil, true)  -- Show full amount for smaller values
+		end
+		row.cost_text:SetText(cost_string)
+
+		row:Show()
+	end
+
+	-- Resize frame to fit content
+	local estimated_height = 44 + (row_count * 14)  -- Header + rows with reduced padding
+	frame:SetHeight(math.max(60, estimated_height))
+
+	frame:Show()
+end
+
+function M.hide()
+	if purchase_summary_frame then
+		purchase_summary_frame:Hide()
+	end
+end
+
+-- Set up handlers - use direct function references instead of M.
+function aux.handle.CLOSE()
+	if purchase_summary_frame then
+		purchase_summary_frame:Hide()
+	end
+	T.wipe(purchase_summaries)
+end
\ No newline at end of file