A featured deal popped up at eBay this afternoon that includes a brand new, unlocked Samsung Galaxy S6 with 32GB of storage for just $529. That is a hell of a deal for a phone we just dubbed the best Android phone you can buy.
This is model SM-G920F, which is one of the unlocked international variants. The other is the SM-G920I. This model should work without a hiccup on AT&T, but should also work well on T-Mobile. I have the G920I as an unlocked Galaxy S6 and have used it on T-Mobile. Both appear to have similar, if not the same, bands.
As for the price, well, this is almost $200 lower than the AT&T and T-Mobile full retail prices. Since it should work on both carriers, this is a tough deal to pass up if you are in the market for a new phone.
eBay Link (free expedited shipping included)