It would be very useful to buy or sell digital goods from your marketplace

golden sun PAL for gba is missing

The mission of pricecharting.com is to estimate "market price" for video games, which typically means what price a game sells for.

Reading the crawled non-auction listings for eBay, the site seems to be showing the "Buy it Now" price. But, eBay has a feature for buyers to put in offers on these "Buy it Now" only listings, and if the seller accepts one of these offers, the game typically sells lower than the "Buy it Now" price. And eBay doesn't appear to make the actual sales data public on these type of purchases. This means estimates on pricecharting.com could get a little inflated, depending on how much influence these "Buy it Now" eBay listings have.

You can publicly tell if a listing is accepting offers via the "Make Offer" button on the site. I think it would be useful to know that information from the crawl, and either use it to influence the estimate or simply annotate it on the web site.

Though, maybe you are already doing this in your estimation, and in that case, it could be noted in your methodology. :)

The graph displaying the values of my entire collection is nice, but I would like to see a graph of a certain system. For example, when selecting my NES collection, I would like to see the graph only display the values of my NES collection. 

Can't found this pack on the site…

Seems like an easy enough expansion with the existing site infrastructure:

Gamecube, SNES, and Sega Genesis hardware/software currently has linked data to Gamestop.com.

Gamestop categorizes these items as Retro.

Other Retro hardware/software (Gameboy, Gameboy Color, PS1, PS2, etc.) do not have linked data to Gamestop.com.

Please link this data for us! I for one would be a much more informed buyer! I'm getting fed up with botched eBay orders and Facebook Marketplace purchases, and am exploring Gamestop as an (often cheaper) alternative to Amazon for my purchases. 

Would love for Price Charting to become more robust in this way.

Being able To browse other user's collections would be quite nice.  Make other users findable on the site but let people opt-out of this feature if they want.

Prices are innacurate for me as I live in Australia and its only possible to view average prices from US ebay.