I don't think it's reasonable to expect a chain pet store to have supplies for every conceivable animal that someone might want to keep as a pet. While I don't know how many hedgehog owners there are out there, I feel safe in saying that the hedgehog owner population is but a fraction of the dog, cat, hamster, gerbil, bird or fish owner population.

That said, Petco should carry Aspen bedding, as it is recommended for many small animals that Petco does carry, such as hamsters, gerbils, rabbits and ferrets.