Deal: Unlocked Samsung Galaxy S6 (T-Mobile, AT&T) now costs $399 on eBay
The $399 Galaxy S6 can be shipped only in the US. It's a 32 GB T-Mobile variant, but, since it's unlocked, you should have no problems using it on AT&T if you wish. The offer will end in 7 days, so there's plenty of time for you to decide if you want to spend $400 on this Samsung handset (unless, of course, supplies run out before those 7 days - the seller mentions that a "limited quantity" is available, having already sold 80 units).
It's not the first time when the Galaxy S6 is being discounted on eBay, but the current $399 price is by far the lowest to date.
Another deal that you may be interested in is related to Verizon's Samsung Galaxy S6 edge 128 GB. This can currently be bought for $599.99 off contract (the phone normally costs $899). Both the Galaxy S6 and Galaxy S6 edge deals can be accessed via the source links below.
source: eBay (Galaxy S6 deal, Galaxy S6 edge deal) via Droid-life