Brickset Price Tracker

About

Brickset tracks WHAT you own — this extension adds what you PAID for it and what you SOLD it for.

It injects a "My Prices" column into your Brickset collection pages (sets and minifigures) — in all three views (List / Gallery / Table) and on individual set/minifigure detail pages.

Features:
• Record buy and sell prices per unit, with date, quantity, note and condition (new / used / not rated).
• Multiple ownership as entries ("lots"): e.g. bought 3, sold 1 → 2 still owned.
• Price signal: your purchase price is colored green/red depending on whether you paid below or above the Brickset market value (new/used).
• "Missing parts" flag per entry.
• Custom collections: group sets and minifigures freely (including batch selection); an item can belong to several collections; filter the list by collection.
• Show/hide table columns.
• Direct link to the BrickLink price guide for each item.
• Overview in the popup and on the collection pages: amount invested, current market value, unrealized profit/loss, and realized profit/loss from actual sales — split by sets and minifigures.
• Full JSON export/import (prices, collections, settings) for backup or moving between devices.

Privacy:
All data stays local in your browser (chrome.storage). Nothing is sent to any server, no tracking, no external code. Market values are only read from the Brickset pages you open yourself.

Note: Unofficial community tool, not affiliated with Brickset or the LEGO Group. LEGO is a trademark of the LEGO Group, which does not sponsor or endorse this project.