I'm in their beta program which I learned about in this forum and I referred a lot of friends and family since I've been really happy with the service (and to get the free month referral credits, naturally). Reach recently added a 1GB plan for $20 which is the type of plan I wouldn't really consider signing up for since I usually use a lot of data, but my brother forwarded me his bill which had a pleasant surprise - even though he was signed up for their $60 10GB plan, he barely used any data last month since he was on wifi constantly... and he was charged for just the $20 1GB plan. Service is on Verizon's networks but they announced that they also are on AT&T's.
This isn't so much a specific deal but worth a mention since I don't know of any other companies doing this. From their site:
Best Fit saves you money
Never overpay for unused data. Pick the plan you want and pay for the plan you actually use. We'll adjust your bill automatically to the lowest possible plan for that month.