So I going to buy 2 32gb iPhone 3GS to run on t-mobile. Is it best to buy them now as people are trying to sell them before the 24th or after when people decide they want the new iPhone 4? I've found a couple for $325 and $350 that are in good condition. Should I expect it to go much lower as time goes on? Is that even a good price? Does anyone have experience with the trends for the previous releases?