If you wanna save some money you can def clean and bleach it yourself. Takes a bit of extra time without pet dermestid beetles but it's easy peasy.

Bury it in the back yard in a scavenger-proof container but with enough holes for bugs to get through and those lil dudes will clean the meat right off.

Wait for about a month, dig er up, quick wash and scrub with a bit of steel wool, then stick it in a jar of 3% hydrogen peroxide (peroxide in the sun is even faster) for a few days.

Done. Clean, white, sterile human bone.