Buy one, get one (free or half off) sales are nothing new to T-Mobile, but if you’ve been waiting on their next round of deals to kick off before upgrading from your current phone then be on the lookout soon: the Samsung Vibrant is now included in the list of eligible smartphones if this internal leak is correct. It sits alongside the Samsung Behold II, MyTouch 3G 1.2, Slide, CLIQ and CLIQ XT, the Garminfone, and the recently released Motorola CHARM (as well as other non-Android handsets).

This isn’t official yet, but it’ll apparently start on September 8th and run through November 2nd. We’re sure we’ll get confirmation via T-Mobile once they start running those tempting BOGO ads nationwide. Just like any BOGO, you pay full price for the more expensive of the two handsets and will get the one that’s lesser or equal value for free on a new two-year contract (extension or new customers).

[via TmoNews]