I'll be in the US for a month or two and would like a cheap option so VMs Pay-As-You-Go sounds good. Do I just go to a VM store and buy a phone and air time? There's really no contract? I can just use if for a couple of months and take it with me or give it to a friend when I leave?

I'll probably just get the Aloha or Marbl so it sounds good if there really aren't any hidden costs.