Bears: WoW Battle Pets

Quest: Adopting the Adorable [10]

Zone: Val'Sharah

Achievement: WoW's 4th Anniversary

Category: Feats of Strength

Drop: Strange Bear Cub

Zone: Thaldraszus

Drop Rate:  1 in 1

Pet Battle: [3-6] Darkshore

Vendor: Derrick Brindlebeard

Zone: Icecrown

Cost: 40 (unlimited supply)

Pet Battle: [25] The Azure Span; [25] Thaldraszus

Vendor: Varlan Highbough

Zone: Molten Front

Cost: 1500 (unlimited supply)

Pet Store 

Promotion: World of Warcraft Collector's Edition

Promotion: iCoke

Pet Battle: [25] Thaldraszus

Drop: Yogursa [50+]

Zone: Arathi Highlands Warfront

Approximate Drop Rate: Unknown

Drop: Primal Bear Cub

Zone: Azure Span

Drop Rate: 1 in 1

Quest: A Sleepy Pet [60]

Zone: Valdrakken

Drop: Thrall's Corrupted Chest

Zone: Horrific Vision of Orgrimmar

Approximate Drop Rate: Unknown