There was a time not long ago that you couldn't even get AT&T-compatible Straight Talk SIMs due to a mysterious shortage. Well, things have certainly turned around. Straight Talk has just started listing 4G LTE service for AT&T devices. You can break free from the traditional carriers, save some money, and still keep your LTE data. That's a deal.
Straight Talk offers monthly plans starting at $45 with "unlimited" data.