What mounts are available for purchase?

[Millfury]

I know elephants are not legal in paizo. In some of the equipment guides
there are animals listed for purchase. Are these animals legal for pfs
play/purchase with out having levels in a class with animal companion?
If so I saw the price on a combat trained wooly rhino at 3k is that reasonable?

[Starglim]

For Pathfinder Society, check the Additional Resources listing for the book that contains the animal as a purchaseable mount. edit: A combat trained woolly rhino appears in Animal Archive on page 14 as a Riding Animal and is a Large animal, so appears to be legal for PFS.