Tabletop RPGs are a good and cost effective hobby. You can play DND with the free “SRD” rules posted online, but you won’t get the fancy pictures and all the extras.

There are other games like it that are even cheaper. My personal favorite is Fate. Free rules, only needs four six sided dice.

The main problem is finding a good group to play with. DND is mega popular so if you’re just looking for social, it’s a good starting point. If you’re not into fantasy, you can branch off into other games later.