The problem with the K1000 is that they've become sought-after by collectors, so prices are getting silly for what is, after all, a very bare-bones camera.
Look for a set of Pentax P30s (or P30n/P30t) instead. They're fully manual (providing you don't set the lenses to "A") but with shutter speeds in the viewfinder, self timer, DOF preview and DX coding. They're smaller and lighter than a K1000 and can be had for next to nothing now as nobody wants the "plastic" body (they actually have a diecast metal chassis underneath). Probably not as robust but at the price you can afford to replace broken ones.
The only snag with them is that some of the original P30 models don't have a socket for a cable release. Later P30s do, as do the P30n/P30t. The latter two have Av mode but you don't have to use it.
If the model numbers seem unfamiliar they were sold as the P3 and P3n in the USA. I've no idea why!