I’m pretty sure that “illegal” equipment is fairly common for the casual player and the equipment is available at any sporting goods store. I just typed “illegal golf equipment” in Google and got over 120,000 hits. I’m sure that you can find some in your area.
Well I’ve got the cheapest method of illegal golf clubs - lead tape. My grandfather added a few strips to my 5 wood and driver and man that thing flies. I hit that 5 wood ~275-300 yards sometimes, and I’m not that great of a golfer. I hit it off the tee, off the turf, anywhere really. Try a few strips, it’s cheap and easy. And I guess you could put some on your ball as well