Go to your local gun clubs of the trap/skeet variety. If you come off as eager, polite, and respectful, most every shooter will allow you to try their gun for some shots or even a full round. Find a type that fits. For American trap, you are only worried about 1 shot (doubles excepted), so anything from a used pump to a trap-specific Ljutic or Kreighoff will do the job. Where I live, there are always guns for sale listed on the club's bulletin board
Good luck!