Traveling to the US, Prepaid iPhone

[finnschi]

Hey guys, I will be traveling to the US in August, for 3 weeks!

What is the best Prepaid deal that I can get for my iPhone 3G? (Its Unlocked)

 

[j3yq]

Where in the US? I think areas differ in prices and providers.

 

[Hellishness]

T-mobile prepaid.