these are battle pets that require rep to buy, but when you have the rep you can buy multiples and cage them.
i didn't include guild vendor pets, since they require more than just getting the rep and buying the pet.
i'm sure i am missing some, please let me know & i'll add
Tiny Sporebat - rare - Sporeggar exalted - 30 glowcap
Nether Ray Fry - rare - Skyguard Exalted - 40g
Pengu - rare - Kalu'ak exalted - 12g
Mysterious Egg - Oracles Revered - 3g
- - (chance for Cobra Hatchling, White Tickbird Hatchling, Tickbird Hatchling, Proto-Drake Whelp, all uncommon, or Green Proto-Drake mount ... but a 30% chance to drop no pet or mount)
Hyjal Bear Cub - rare - and
Crimson Lasher - rare - Molten Front, 445 marks to unlock vendors - 1050g each (after guild barter)
Rustberg Gull - uncommon - Tol Barad Faction honored - 50 Tol Barad marks
Fox Kit - rare - Tol Barad Faction exalted - 200 Tol Barad marks
Tiny Goldfish - uncommon - Anglers Honored - 250g