Charity shop cameras and whatever film is cheapest.
Kentmere 400 is half the price of HP5 and for most of what I shoot I cannot honestly tell the difference in prints. It curls more when drying and the base is thinner, so loading the reels is fiddlier. At 800 in DD-X it holds up surprisingly well.
Bought the K1000 from a charity shop for £45 with a 50mm f/2. The light seals had turned to tar, so the first job was scraping them out with a cocktail stick and replacing them with foam from a craft shop. First roll was Ilford FP4 in the park on a grey Sunday. Twenty-nine usable frames out of thirty-six, and the seven bad ones were my fault, not the camera's.