Yup, Caren got to it before I did, but she's right on the money. You know hanging plant baskets that people keep ferns and such in? These are sold as the liner for those baskets and come in a few different shapes and sizes starting around $4 or $5 in pretty much any store that has a good garden section. She still loves that hide, and it's easy to turn into a humid hide or leave as is, and can be cut to the right height to be snug for your ball python. You can either cut an access hole in the base with garden snips or similar, or you can cut it higher up in the side to simulate a burrow like I did.

Edit: By the way, there's still no mold on the hide. Apparently coconut fiber is quite mold-resistant, which would explain why it would make a good hanging basket liner. I'll be buying more of these when finances are a little less tight around here.