Milo

From a YouTube co-founder, a chaired prof at Wharton, a PayPal EVP, and more, wicked-simple Milo trolls over 100,000 locations of 20 major retailers (Best Buy, Ikea, Borders, etc) to tell you where any item you're looking for is in stock near your zip, plus any pricing data they can find, potentially useful ammo when begging your mom for a ride to the mall.