AT&T Prepaid now offers unlimited talk/text & 8GB/month LTE data for $300/year when you pay in advance (not sure if taxes are included)...IIRC unused data rolls over one period.
Biggest advantage (IMHO) is that AT&T Prepaid supports hotspot at no additional charge (many MVNOs don't support hotspot at all or charge you extra)
Thanks. $25 is a great price for 8GB but we just don't need that much. 5GB for $20 will be plenty. Red Pocket supports AT&T tethering on Android (but not iOS), with no limitations or extra cost. I rarely, if ever, use hotspot anyway.