SnapTheShelf - Find value with a single snap

I have wanted access to this product for a few years now but it didn't exist. Every now & then I would search around to see if someone made anything similar & all I found was other people saying things like why hasn't someone built this product yet. The only other apps out there require the user to scan each book individually & that is just too time consuming. So, I figured I needed to build this myself. Just in the past 2 weeks or so I have found a number of expensive books floating around in thrift stores for an average of below $4.00 each.