ATT offers $40 month, unlimited data but throttled after first 2 Gig. Just sayin ...
What AT&T doesn't offer is reliable service. We had very spotty service in our last house and our current house. No problems with Verizon. I'd try the T-Mobile deal, but they don't have a presence in Alaska.
It was many years ago but we had major problems with AT&T adding random charges to the bill, they were always good about removing them but we could count on spending an hour on the phone with them every other month.
We went to T-Mobile and just stayed because there was no drama, no over charges, no surprises.