For homemade hides, I've used "I Can't Believe.." tubs, sour cream pint tubs for the Kenyan SB baby, heavier plastic tubs and lids from the horse aspirin (I had oodles of those...). I've even saved and used the salad containers from my Wendy's lunches. They're a little flimsier, but work for the smaller snakes. Just have to tape or seal the edges/ make the holes bigger. They can be a little sharp sometimes.

I buy the nukeable Gorton's shrimp bowls for work, and I've used them too for the yearlings/smaller snakes...they're the right size, black, and not as flimsy.

The little snakes got the sour cream pints cups for water bowls, etc. until they get so big they keep spilling the water. So I've waited until rabbit crocks are on clearance and then use those.