This app was mentioned in 1 comment, with an average of 1.00 upvote
This is actually a very useful website for flipping too. It has a whole catalog which I often use. They've got an app for the bidding site not the catalog site: https://play.google.com/store/apps/details?id=com.catawiki2
Catalog site: https://www.catawiki.com/catalog#top