$0, or $30, depending on how you look at it.
Our HOA pays $30/month per unit for 1Gbit/sec service through WebPass (now owned by Google Fiber.) They have to pay for every unit in order to qualify for this price. Otherwise, (and prior to the HOA signing up for this deal) it would cost $60/month for individuals to subscribe.
WebPass uses an RF link. There is an antenna on the roof (actually, dual antennas, they come single or dual - dual for greater bandwidth) pointing at a nearby building that has fiber service. It's delivered over CAT5 cabling that was installed when the building was renovated circa 2000. (The building was constructed in 1927.)
While the bandwidth is shared by 85 units, some don't use the service, and of course only a small number are actually using any significant bandwidth at any one time. SpeedTest (MacOS app) shows consistent speeds of 800+ mbps. Just ran a test and at 7pm (pretty much peak time!) I got 799 down, 869 up.
I dropped Cox Cable several months ago. I was paying over $200/month for cable channels and 300mbps down/50mbps up Internet service. I do have Hulu, Netflix, Amazon Prime, Apple TV and a Tablo 4-channel Over-the-air DVR. When I cut the cord, I added Hulu. (ad-free only, no streaming channels). (Already had Netflix and Amazon Prime, which I have for delivery anyway.)
A friend owns apartment buildings in the area - about 40 units - and he went for the same deal. He gives his tenants free Internet, and pays $30/month/unit. I was skeptical, and I grilled the WebPass folks on his behalf when he made that decision. (I hadn't signed up myself at that point, and then the HOA decided to pop for the deal to get it for everyone.)
Though there have been occasional brief outages, I have always been able to reach their customer support by phone and problems have been quickly resolved. The last incident was when the fire alarms were being tested, and the alarm company inadvertently cut the circuit breaker that the RF equipment and main router are on...
Being on the Google backbone is fantastic, very low latency. I'm in San Diego, and it is ~4mSec to Los Angeles major backbone and Google servers, 33mSec to Dallas (major hosting centers).