Essentially it’s a mobile Craigslist with notifications and location-based searches for classified listings. You can enter any neighborhood, do a quick search, and pick up a broken girls bicycle seat or a gently used full body cast for a few bucks

via The New Grabio Lets You Grab Classified Deals On The Go | TechCrunch.

There are a few similar services out there, most notably EggDrop and Zaarly, but Grabio uses a location aware API notifies you when you’re near deals.