Southern African baboons with a bony horn growing out of the carapace, which is not a decoration but a genuine anatomical oddity nobody has fully explained. C. marshalli has the tall straight one. C. darlingi has a shorter hooked version.
Old world, so no urticating hairs and a real threat display instead. They are fossorial, they web their burrow entrances into a dense mat, and they are fast when they choose to be. Not aggressive so much as absolutely unwilling to be handled.
Prices here are moderate and stable because South African and European breeders produce them reliably. The horn is the marketing, which means juveniles before the horn develops sell at a discount to visibly horned subadults even though they are the same animal a few molts apart.