When I've raised baby snakes that out-grow hides so quickly anyway I've often used little (clean) boxes for them & cut a little doorway; if the box is a little
too big, you can crumple a couple paper towels to put inside so the snakes feel snug. When these hides get dirty, toss 'em & make new ones...easy!

If you need to order some hides, Reptile Basics has good ones that aren't expensive & come in many sizes. http://www.reptilebasics.com/hide-boxes