Zap

Drop: Siegecrafter Blackfuse [??+]

Zone: Siege of Orgrimmar

Approximate Drop Rate: 1 in 125

Vendor: Burt Macklyn

Zone: Burning Steppes

Cost: 3 (unlimited supply)

Quest: She's in a Happier Place [50] (Alliance), He's Dead, Jastor [50] (Horde)

Zone: Tiragarde Sound, Zuldazar

Vendor: Quartermaster Huseng

Zone: Ohn'ahran Plains

Faction: Maruuk Centaur (Renown Eight)

Cost: 5 20 150 (unlimited supply)

Trading Card Game: Worldbreaker

Pet Store 

Pet Battle: [25] Mechagon

Vendor: Micro Zoox

Zone: Dun Morogh

Cost: 1 (unlimited supply)

Profession: Battle for Azeroth Engineering [125]

Taught By: [Schematic: Mechantula]

Drop: The Curator [??+]

Zone: Karazhan

Approximate Drop Rate: 1 in 20

Profession: Engineering [205]

Taught By: [Schematic: Pet Bombling]

Vendor: Jenoh

Zone: Vol'dun

Cost: 250 (unlimited supply)

Vendor: Dodger (A)

Zone: Boralus

Cost: 250 (unlimited supply)

Requires: A Shady Message

Achievement: Pet Emporium

Category: Collect

Pet Battle: [25] The Waking Shores

Dragonflight World Event:  Primal Storm

Drop: Brutallus [??+]

Zone: Sunwell Plateau

Approximate Drop Rate: 1 in 20

Drop: Pa'ku's Aspect [??+]

Zone: Battle of Dazar'alor

Approximate Drop Rate: Unknown

Pet Battle: [25] The Waking Shores

Scenario: Island Expeditions

Approximate Drop Rate: Unknown