Since I've just renewed service for my internet connection on the boat, Calyx Institute still seems to be the best deal for unlimited (not that throttled to nothing after xGB nonsense sold as "unlimited") internet access. I have rarely, if ever, had any connection issues in over four years onboard and hundreds of miles along the ICW. Over a few miles offshore where cell signals disappear, of course requires satellite connection.
The lowest upfront cost is $150 for 3 months [+1 free] including a wifi hotspot device. Paying yearly results in a lower per month cost - as low as $33/mo after the first year.
Sign up here to get an extra month free.Between internet and phone service (USMobile - which I only need minimal internet access on), I'm under $50/mo for connectivity, excluding domains and servers.