Several cities in the United States have implemented municipal fiber. There are a few different models [1] but my favorite is "open access", where the city owns the fiber and allows many providers to use it. (See more here [2].)
UTOPIA, a consortium of cities in Utah, operates under an open access model. You pay a $30 fee to the city for the line and then choose from 12 different ISPs [3]. A symmetrical 1Gbps plan is around $50, so $80 total. You can even get a 10Gbps plan for $200. If you're having problems with the ISP you're using, you just go online and change it.
Utah is one of those states that has laws that were originally crafted to prevent municipalities from providing the service by big ISP lobbyists. The law prevents municipalities from offering the service directly to consumers (still does), so UTOPIA was born with an open access network via a 'loophole' if you will in the laws.