@Glasshouse- Frisbee golf supplies, or more appropriately disc golf supplies, can be bought at most sporting goods stores and a number of places online. You can get started playing disc golf for about thirty or forty dollars. You could get started with one disc, but you would be best suited to buy at least three. If you like the sport, you can eventually buy different discs for different situations as well as a disc bag and score keeper.
The beauty of disc golf is it is easy to take your discs with you when you travel. Every time I fly across country to visit family, I bring a few of my discs so I can play some of my favorite courses on the east coast. I have also driven across country with a bag of discs, playing new courses along the way. It is an interesting way to break up a sometimes boring drive, and meet interesting people during the trip.