Thanks for this feedback.  I might need to set this as a user preference.  Some people prefer searching via UPC codes and scanning one UPC, then scanning another UPC without having to clear the results.  

Or maybe I clear results only if the previous search was a UPC?  But leave the text searches?  I'd love to hear your thoughts on this.

The charts show all the data that we have.  We have about 1 year's worth of pricing for Pokemon cards.  Unfortunately we can't go back any further on those charts.

That will be the best tool to see the price increase or decrease by cards.  

We have a "Hot Cards" section that will show some items that have increased (or decreased) the most in the last 30 days.

Hot Pokemon Cards

If you change the sort order you can see cards that decreased in value too.

Unfortunately I do not have server log data showing all the calculations that went into that price calculation so I cannot say the exact reason the price declined.  My initial thought is it was based on kicking out outliers, the age of listings, and when we calculated the last price.  We might not have considered all of those recent, incorrect sales in the most recent price calculation depending on when they happened and when we last recalculated the price.

Thanks for the feedback.  Several of the most recent sales were for the game AND box.  Those inflated the recent sales prices.  Those have been removed now.  The last three sales for the game only have been $2,046, $3,400, and $2,175.  Based on those and all the other sales we calculate the value at $2,322.  

Fixing this now.  Will be fixed in the next hour.  Sorry we didn't update the fee calculation correctly when Paypal changed their fees.

Can you please link me to the exact Super Mario game you are referring to?  I'll look into removing any sales that are listed by mistake.  

Heritage Auction is a source just like eBay though.  We consider them in our pricing calculations.  Heritage is much more focused on the high end market though so generally their sales only impact the Graded prices.

Closing in favor of duplicate:

https://sportscardpro.userecho.com/en/communities/1/topics/140-add-australia-football-cards

Thanks for that suggestion. So you'd rather the "add another copy" feature would just increase the quantity available for that item instead?  

If you click on an item in your collection already and then click "Edit", you can change the quantity there.  That might be a work around until we implement the change you requested.

Thanks for this bug report.  I'm looking into what is happening and hopefully I can fix it soon.

Can you explain this feature idea a bit more?  Can you give me a url on the site where this would be an option?