Your comments

The "notes" section is probably the best place for that information.  You or other users can make a note about the original source box/tin/etc where the card was available.

Which Topps Chrome Marvel sets are we missing?  We can definitely add those.

We don't support Disney cards at this time though.

This is a feature on the site and app now.  

You can click the UPC icon on the website, near the search bar on most pages.

On the app, you can click "Scan Card or Barcode"

We do not support DC cards on the site at this time.  You can vote for that suggestion here:

https://pricecharting.userecho.com/communities/1/topics/2210-add-dc-comic-cards