Discs cost only $15-20 new, used ones can be only a few bucks, you only need one or a few to play, and most courses are free.
In reality, you keep buying new discs. And a bag to carry them. And more discs. And a bigger bag. Then a home basket. And a net to practice in. And more discs. Then a rack to hold the extra discs you can’t bag…. It adds up!