That wordy title says it all. A seller on eBay has a pretty solid deal alert for an Unlocked 32GB Samsung Galaxy S6. You can grab it for only $399.99. This is new with a full factory warranty as far as we could tell from the listing. This one is unlocked for T-Mobile, but should work fine on AT&T as well.
They also have a 128GB Verizon branded Samsung Galaxy S6 Edge for only $599.99. This Verizon model is unlocked as well, but it still might have you stuck on Verizon or Sprint. Be sure to double-check each listing to make sure either model will work for you. Here are the links:
Don't forget to drop by our dedicated Samsung Galaxy S6 and S6 Edge forum for further discussion: Samsung Galaxy S6, S6 Edge and S6 Edge Plus | Android Forum at DroidForums.net