Check out Microcenter or TigerDirect. They both have retail stores as well as online stores. Their online price and store price are a little different, so if you see no sales online, they might have in store. Both of those are located in Chicago, I know.
But, if you want Amazon, get those WD My Passport (whatever color you like). My sister-in-law has a 320GB passport and loves it.
*pst* 99% of my hdds are WD