[icanberk]

Semantics 3 seems to be the only good solution out there.

[lnanek2]

I've been talking with Semantics3 about using their API to give more results in a Google Glass shopping comparison hack I did recently: http://www.youtube.com/watch?v=6f9fh6vq6zs

It does look good and they've been very responsive. Some other APIs I've seen, though: http://www.scandit.com/ http://www.simpleupc.com/ https://developer.getinvisiblehand.com/ http://prosperent.com/ http://www.retailigence.com/

Some other APIs I've used are ShopSense ( http://www.youtube.com/watch?v=GwlABP0z_ms ) and Gilt ( http://www.youtube.com/watch?v=UYprO-9rrmQ ), although those are fashion and home. Others have mentioned using the Sears API.