Burrow

Pet Battle: [1-2] Dun Morogh; [1-2] Durotar; [3-4] Northern Barrens; [7-9] Northern Stranglethorn; [9-10] Southern Barrens; [16-17] Blasted Lands; [17-18] Hellfire Peninsula; [18-19] Nagrand (Outland); [25] Spires of Arak; [25] Nagrand (Draenor)

Vendor: Breanni

Zone: Dalaran (Northrend)

Cost: 50 (unlimited supply)

Pet Battle: [1-2] Dun Morogh; [17-18] Winterspring

Pet Battle: [20-22] Borean Tundra; [22-23] Dragonblight; [22-23] Zul'Drak; [22-23] The Storm Peaks

Pet Battle: [15-16] Burning Steppes; [20-21] Shadowmoon Valley (Outland)

Promotion: StarCraft II: Heart of the Swarm Collector's Edition

Vendor: Xan'tish

Zone: Orgrimmar

Cost: 50 (unlimited supply)

Pet Battle: [20-22] Borean Tundra

Pet Battle: [11-12] The Hinterlands; [18-20] Blade's Edge Mountains; [25] Gorgrond

Vendor: Halpa, Naleen

Zone: Mulgore - Thunder Bluff

Cost: 50 (unlimited supply)

Vendor: Dealer Rashaad

Zone: Netherstorm

Cost: 10 (unlimited supply)

Vendor: Xan'tish

Zone: Orgrimmar

Cost: 50 (unlimited supply)

Pet Battle: [25] Highmountain

Quest: Pet Battle Challenge: Wailing Caverns [110]

Zone: Northern Barrens

Drop: Damp Pet Supplies

Approximate Drop Rate: Unknown

Drop: Mysterious Egg after 3 days becomes [Cracked Egg]

Contains: 1 in 5 options

Pet Battle: [23-25] The Jade Forest

Pet Battle: [5-7] Stonetalon Mountains

Promotion: Authenticator Account Link

Vendor: Dealer Rashaad

Zone: Netherstorm

Cost: 50 (unlimited supply)

Vendor: Xan'tish

Zone: Orgrimmar

Cost: 50 (unlimited supply)

Pet Battle: [25] Suramar

Drop: Darkmoon Rabbit [??+]

Zone: Darkmoon Island

Drop Rate: 1 in 1

Drop: Imperial Python [90]

Zone: Timeless Isle

Approximate Drop Rate: 1 in 33

Pet Battle: [20-22] Howling Fjord

Drop: Icehowl [??+]

Zone: Trial of the Crusader

Approximate Drop Rate: Unknown

Pet Battle: [25] Dalaran (Broken Isles)