AT&T's Fiber 300 plan is no exception. Even though it's the provider's cheapest internet plan, it has a cost per Mbps of around 18 cents. That's the highest speed/price ratio of any AT&T Fiber plan.

If you're living in one of the 22 states where AT&T provides wired internet service and are one of the eight million customers eligible for the company's fiber internet plans, you're in luck.