Samsung's biggest phones of the year - so far - are currently on sale over at eBay, for a pretty decent price, actually. These are both factory unlocked and GSM models. So they will both work on AT&T and T-Mobile as well as other carriers using their networks, like Straight Talk, Simple Mobile and others. The Galaxy S6 is available in black, white, gold, and blue. While the Galaxy S6 Edge is available in just black (it's been on sale longer, so that's likely why the other colors are sold out).
It's a great price on both of these smartphones. Which sport a 5.1-inch 25601440 resolution display, Exynos 7420 processor, 3GB of RAM and 32GB of storage. Not to mention, one of the best cameras around on a smartphone. You can grab either or both from the links down below.
Samsung Galaxy S6 - $499
Samsung Galaxy S6 Edge - $599