Prowl

Vendor: Mei Chele

Zone: The Wandering Isle (Monk Order Hall)

Cost: 1000 (unlimited supply)

Vendor: Pelefien

Zone: City of Threads

Cost: 2250 (limited supply: 1)

Drop: World Drop

Zone: Hillsbrad Foothills [7-30]

Approximate Drop Rate: 1 in 8,000

Vendor: Donni Anthania

Zone: Elwynn Forest

Cost: 40 (unlimited supply)

Pet Store 

Vendor: Breanni

Zone: Dalaran (Northrend)

Cost: 50 (unlimited supply)

Pet Battle: [1-2] Eversong Woods; [1-2] Elwynn Forest; [1-3] Silvermoon City; [7-8] Arathi Highlands; [20-21] Netherstorm

Pet Battle: [3-4] Northern Barrens; [9-10] Southern Barrens

Pet Battle: The Eternal Palace (Raid)

Pet Store 

Pet Battle: [25] Bastion

Vendor: Donni Anthania

Zone: Elwynn Forest

Cost: 40 (unlimited supply)

Drop: Courage

Zone: Bastion

Drop Rate: 1 in 1

Pet Battle: Tazavesh, the Veiled Market (Dungeon)

World Event: Hallow's End

Vendor: Woim

Zone: Tirisfal Glades

Cost: 150 (unlimited supply)

Vendor: Pippi

Zone: Stormwind City

Cost: 150 (unlimited supply)

World Event: Darkmoon Faire (first week of each month)

Vendor: Lhara

Zone: Darkmoon Island

Cost: 90 (unlimited supply)

Drop: Darkmoon Game Prize

Zone: Darkmoon Island

Approximate Drop Rate: 1 in 1,250

Drop: Playful Vulpin

Zone: Ardenweald

Drop Rate: 1 in 1

World Event: Hallow's End

Vendor: Woim

Zone: Tirisfal Glades

Cost: 150 (unlimited supply)

Vendor: Pippi

Zone: Stormwind City

Cost: 150 (unlimited supply)

Pet Battle: [1-2] Dun Morogh

Drop: P.O.S.T. Master [??+]

Zone: Tazavesh, the Veiled Market

Approximate Drop Rate: Unknown

Vendor: Adjutant Nikos

Zone: Bastion

Faction: The Ascended - Revered

Cost: 250 (unlimited supply)

Promotion: Recruit-A-Friend

Drop: Ascended Supplies

Zone: Bastion

Approximate Drop Rate: Unknown

Drop: Larionrider Orstus [62+]

Zone: Bastion

Covenant: Kyrian

Sanctum Feature: Anima Conductor (tier 3)

Approximate Drop Rate: Unknown

Drop: Lady Ashvane [??+]

Zone: The Eternal Palace

Approximate Drop Rate: Unknown