I have made my own hides out of clay. Super easy way to get hides if you have access to a kiln. for my big boa i bought a black rubbermaid container and cut a hole in the front for him to go back and forth out of. For little snakes i have used old butter dishes or sourcream cups. Just make sure what ever you use has one entrance/exit and is dark and kinda cramped. snakes like small tight spaces.
I would attempt to make my own hides but I'm not a crafty person by any means. When you cut a hole in your container did you find a way to 'sand down' the edges? I would be worried about the edges being to sharp.