I live in Europe, travel Europe and USA. I want an iPad 2 with 3G so I can use 'pay as you go' for WiFi. The prices in USA are a lot cheaper that Europe and would like to buy one in USA. But I'm confused...all the stores I've looked at on-line, i.e. Best Buy, Target, Walmart to name a few, have the iPad tied into AT&T or Verison. I'm not sure if I can buy there without a contract on either of those - an 'unlocked' iPad. Can anyone advise please?