Penguins: WoW Battle Pets
Select a pet:

Promotion: Northrend Heroic/Epic Upgrade
Bnet Shop: Classic

Vendor: Sairuk
Zone: Dragonblight
Faction: The Kalu'ak - Exalted
Cost: 12 (unlimited supply)
Vendor: Tanaika
Zone: Howling Fjord
Faction: The Kalu'ak - Exalted
Cost: 12 (unlimited supply)
TIP: You can search for a specific pet using any word found in the pet's name or item. You can also search using obvious keywords like "robot," which will return all robot-like pets.