So I'm running a 4GB 2G iPhone and it's getting old now with the amount of space I have. I bought my original one second week out and then had it replaced by apple a year later. With the 3G refurbs popping up at AT&T, it's got me interested in maybe trying to track down a 16GB or even an 8GB model and get rid of mine. Does apple or AT&T sell these or am I stuck with ebay/craigslist?