I think since the data question is so hard, sites like these end up just showing me the big box retailers. For example, this product http://milo.com/samsung-vehicle-charger-1 shows as available from Best Buy for $39.99 but I actually bought one of these at a 99 Cent store, for, you guessed it: $0.99! Those are the finds I'm looking for in a local search. And I'm sure Fry's, Radio Shack, Target, and WalMart have these too, but they aren't on the list.