This FREE price research site lets you track prices of merchandise sold at eBay and Amazon. You will get a lot of valuable statistics from this unlimited transaction data:
View active listings of any "THINGS" you want to buy or sell at eBay or Amazon.
View recent sold prices of "THINGS" of your interest by clicking the "Past Sold Listings" tab (average, high and low price).
View "THINGS" that don't sell by clicking the "Expired Listings" tab.
Learn how to be a savvy buyer/seller by studying the average price and sell through rate etc.
View what product is hot in "Hot Searches" which lists all the searches by "Sell Thru" rate, or by any other criteria of your choice.