This deal isn't for everyone, but if it is for you, it's a really good one. The device in question is a carrier locked AT&T LG G3 in either of its color schemes and 32 GB of storage. No matter how you choose to buy it - without a contract, on-contract, or via the Next program - you'll get a $100 Amazon gift card after your purchase.
What's the catch? Well, there aren't too many, beyond the fact you basically need to use AT&T. If that's what you were looking for in the first place, you've found yourself a great deal. Including the gift card, a $379 effective price for the G3 is as good as we've seen. On contract, you're basically getting a free bonus to sign up. Or, if you go with AT&T Next, you will have your first 3-6 months paid for.
Be sure to read the offer's terms and conditions, but it is relatively straightforward. The deal ends February 14th, the credit will go to your account within three weeks of the transaction, and you cannot use it with an AT&T business or government plan.