I've added this set now.

One Piece: Wings of the Captain OP06

Adding other sets would be a much bigger ask because we don't support those on the backend yet and it would take lots of coding to include.

Is MLB Showdown a TCG or a sports card set?

I've moved that sale now.  Thank you.

Price will update soon based on the revised sales data.

Thank you.  I will add those cards later this week when I get back from a family trip.

Does the box indicate if it is first wave or second wave?  If so, how are they different?

Are only the boxes different or are the cards different too?

Please let me know your user name on the site.  I will see about giving you contributor privileges so you can add these missing Japanese games.

We didn't add your sale because the description said parts of the console were damaged or broken.  We do not track sales data for items like that.  Sorry.

Thanks for that feedback.  I wouldn't say they are useless if it just takes an extra click to see the original listing.  Definitely an annoyance that eBay adds that, but that is outside of our control unfortunately.

A wayback machine kind of thing would be technically possible, but pretty complicated and expensive because of the sheer number of listings we add every day.  100,000+ sales are added every single day.

I've added some missing sales for that RE5 Limited Edition console.  Thanks.

Prices do not include shipping.  Shipping is different for everybody buying the items depending on their location.  So the final price would be different.  We only include the price of the item.  

The website and app should both support UPC barcode scanning.  You can submit a photo to the website using a your computer webcam (or a UPC scanning device).  On the app, you can search by UPC code too.  Click the "Scan Barcode or Card" button on the iOS app home page.  Then click the "UPC" symbol (the symbol on the right).  The other symbol is for searching for cards by photo instead UPC.

Let me know if this works for you.  If you have any problems let me know too.

What do you mean by groups?  Can you give me an example item and what group it is in?