Plant Life: WoW Battle Pets

Drop: Branchlord Aldrus [50+]

Zone: Arathi Highlands Warfront

Approximate Drop Rate: Unknown

Vendor: Irisee

Zone: Icecrown

Cost: 40 (unlimited supply)

Pet Store 

Drop: Grove Vine

Zone: The Dreamgrove (Druid Order Hall)

Approximate Drop Rate: 1 in 2 options

Vendor: Jenoh

Zone: Vol'dun

Cost: 150 (unlimited supply)

Vendor: Madeline Netley

Zone: Stormsong Valley

Cost: 150 (unlimited supply)

Drop: Carnivorous Lasher [50]

Zone: Nazjatar

Approximate Drop Rate: Unknown

Vendor: Naron Bloomthistle

Zone: Lunarfall

Cost: 1000 (unlimited supply)

Vendor: Tarnon

Zone: Frostwall

Cost: 1000 (unlimited supply)

Vendor: Ayla Shadowstorm

Zone: Molten Front

Cost: 1500 (unlimited supply)

Drop: Mandrakor [15-40]

Zone: Gorgrond

Drop Rate: 1 in 1

Drop: Zim'kaga [50+]

Zone: Darkshore Warfront

Approximate Drop Rate: Unknown

Drop: Onu [50+]

Zone: Darkshore Warfront

Approximate Drop Rate: Unknown

Quest: Pet Battle Challenge: Wailing Caverns [45]

Zone: Northern Barrens

Drop: Damp Pet Supplies

Approximate Drop Rate: Unknown

Profession: Legion Herbalism

Zone: Antoran Wastes, Krokuun, Mac'Aree

Vendor: Cortinarius

Zone: Ardenweald

Faction: Marasmius - Friendly

Covenant: Night Fae

Sanctum Feature: Transport Network (tier 1)

Cost: 250 (unlimited supply)

Vendor: Master Clerk Salorn

Zone: Ardenweald

Covenant: Night Fae

Sanctum Feature: Anima Conductor (tier 1)

Cost: 250 (unlimited supply)

Drop: Grove Vine

Zone: The Dreamgrove (Druid Order Hall)

Approximate Drop Rate: 1 in 2 options

Achievement: Family Familiar

Category: Battle

Pet Battle: [1-2] Eversong Woods

Quest: Lawn of the Dead [1]

Zone: Hillsbrad Foothills

World Event: Hallow's End

Item: Crudely Wrapped Gift (obtained via daily Hallow's End quest)

Daily Instance: Headless Horseman [??+]

Drop Rate: 1 in 20 dropped (avg. all sources; available 15 days per year)

Vendor: Woim (H) / Pippi (A)

Zone: Tirisfal Glades / Stormwind City

Cost: 150 (unlimited supply)

Drop: Freya's Gift

Zone: Ulduar

Approximate Drop Rate: Unknown

Vendor: Spindlenose

Zone: Ardenweald

Faction: Court of Night - Friendly

Covenant: Night Fae

Sanctum Feature: Anima Conductor (tier 1)

Cost: 250 5 (unlimited supply)

Vendor: Rook Hawkfist

Zone: Icecrown

Cost: 40 (unlimited supply)

Drop: World Drop

Zone: Valley of the Four Winds [15-35]

Pet Battle: [6-7] Wetlands

Vendor: Elwyn

Zone: Ardenweald

Covenant: Night Fae (Renown 27)

Cost: 1500 20 (unlimited supply)

Achievement: That's a Lot of Pet Food

Category: Collect

Vendor: Burt Macklyn

Zone: Burning Steppes

Cost: 1 (unlimited supply)

Quest: Remembrance of Auberdine [5] (A)

Zone: Darkshore

Vendor: Apothecary Furrows (H)

Zone: Darkshore

Cost: 50