Yeah, there are so many. The main thing to look out for is manual exposure and a meter. Pretty much all of them are reliable. If they weren't they wouldn't be working now
Canon lenses are quite cheap too. I've been looking for a cheap FD body, but haven't found any near me.
The K1000 is not bad, but can have pretty bloated prices. It's a great student camera, but shouldn't cost $100 when it has no self timer, the lens cap is the on/off button (drains battery when lights hits meter), no multi exposure, bulky size and no auto exposure modes. It doesn't offer more than say a Minolta X700 other than being mechanical and working without batteries.
I'd be all over it if it cost like 30-50 with a lens, but you can almost get a Pentax MX for the price some copies are fetching.