Buy.com is offering an official Apple Unlocked iPhones now for $799. This is an official Apple iPhone which isn't jailbroken. You can do iTunes updates and not have to worry about locking your iPhone up again.
Strangely, they say that the iPhones may be from other countries so they might have instructions in languages besides English. This looks like another inventory clearing measure by Apple. Perhaps the US has less inventory than other countries?. If you've wanted a Tmobile iPhone without jailbreaking hassles/issues, now is you chance. Check the video on Buy.com's website.