At&T Prepaid SIM card for iPhone 4/4s

If you are travelling to the US and need a prepaid SIM card for your iPhone, check this out.
AT&T Go-Phone Prepaid Micro SIM Card for iPhone 4 and iPhone 4S

OR if you need a prepaid phone, check this out.

Pantech Crossover Prepaid Android GoPhone (AT&T) with $25 Airtime Credit