If you want to pay a bit more for aesthetic and keep something prettier or more natural, look for larger pieces of cork bark. It comes in tubes similar to the one in the picture that looks like aquarium decor, but it a soft enough material that it can be ripped apart fairly easy if it became necessary. Local reptile stores would be the cheapest places to find it, but you may get lucky elsewhere. Online works too, but may end up being smaller than you anticipated if you don't visualize sizes from numbers very well (or a seller ripping you off).
There are plenty of other reptile specific hides that are more aesthetically pleasing as well.
Aim to get things that either lift off (like the black plastic hide above) or have holes wide enough for (in my opinion) 2x the thickest part of your snake. They often double back through holes and can get wedged in like that and you want plenty of clearance for any lumps post-feeding.
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