Try Saddlebrook, Common Ground, they both used to rent gym space years back. Also try find a parent with connections to schools. Many schools have gym openings when you consider you can typically get 2-4 teams a practice each night, depending on size of gym. I used to call the Millard Schools and try and get the leftover slots that were not selected by schools through the Y (or also feeder programs). You have to get ahold the right people at the district offices (at least that used to be true for OPS and Millard Schools). You may have to take later slots or Fri nights, as everyone wants the M-Th night practice slots.
Another option: You can also look for open gyms and hold "shoot arounds" where kids can just show up and shoot or play 1v1, 2v2. No coaching is typically allowed, but you can work one on one with players.
Another option: Reach out to another coach in your league, see if they'd be interested in sharing gym space for practices. You can hold scrimmages against each other, live drills, etc. OSA runs all their practices with 2 separate teams (20 players) on one court, it can be done 😉.
Good luck!