Chances are your city has a local club that will provide you with a bike to play. Bike polo is a free fun sport that is kind of a mix between horse polo and street hockey.
Most clubs play casual pick up games weekly and even offer beginner/training nights.
Check out
https://leagueofbikepolo.com/clubs for a listing of all the clubs.
Of course you can build a pimped out polo bike with custom frames, sport specific parts, brake guards and wheel covers etc.
Hit me up for more info!