Flips Flops are plastic formed into little shoes that go between your toes...how hard can they be to produce?
Old Navy consistently produces cheap comfortable flip flops at a fraction of the price that other retailers have them available. I would never spend 10 or 20 bucks on a plastic pair from Banana Republic or Eddie Bauer because you are getting the exact same thing as the good old Old Navy brand at $2.50.
For nicer flip flops, check out J Crew...
Note: Flip flops at Old Navy are going right now (November) for about a buck!