Looking for free use beats

Just what it says. Back in the day I honed my craft making a couple mixtapes going over commercial instrumentals. This was the G-Unit days. It was cool to take other people's beats.

I just started rapping again maybe 18 months ago. I need like 50 beats just to make tracks to and fuck around. In the end probably have a bunch of mediocre throwaway tracks. If I wrote something good I'd probably pay for a better beat.

Anyone know where this can be done? Should I just go back to jacking beats? It's not like I plan to sell it.