Looking for some cheap non-physical hobbies to expand social network and meet quality males.

Why non-physical? I lift 5 times a week so I don't have time for MMA, biking, running, soccer and shit like that. I do a very strenuous routine at the gym so I wouldn't be able to recover properly either.

Why cheap? I'm a poor student already paying for gym membership. Can't afford other high membership fees or buying loads of expensive gear (so camping, photography etc. are excluded)

Any suggestions?