We've seen an explosion of "Tinder for X" products on Product Hunt but Kwoller is one of the few examples I've seen where the simple UX of flicking left or right paired w. smart alerts has benefit for e-commerce (i.e. smart sales that are pushed to you).
Boutiny (http://www.producthunt.com/posts...) and WISHCLOUDS (https://itunes.apple.com/us/app/...) offer similar utility.
Polywork