Miscellaneous Elemental: WoW Battle Pets

Drop: Shannox [??+]

Zone: Firelands

Approximate Drop Rate: Unknown

World Event: Midsummer Fire Festival

Vendor: Midsummer Merchant (Horde) / Midsummer Supplier (Alliance)

Cost: 350 (unlimited supply)

Drop: Chest of Massive Gains

Zone: Zaralek Cavern

Approximate Drop Rate: Unknown

Vendor: Celestine of the Harvest

Zone: Ohn'ahran Plains, Thaldraszus, The Azure Span, The Waking Shores

Cost: 250 (unlimited supply)

Pet Store 

Pet Battle: [25] Isle of Dorn

Drop: Beth'tilac [??+]

Zone: Firelands

Approximate Drop Rate: Unknown

Quest: Home Is Where the Candle Is [73]

Zone: The Ringing Deeps

Drop: Spine of Deathwing [??+]

Zone: Dragon Soul

Approximate Drop Rate: Unknown

Pet Battle: [25] Zaralek Cavern

Drop: Researcher's Gift

Zone: Zaralek Cavern

Approximate Drop Rate: Unknown

Drop: Eternas the Tormentor [60]

Zone: The Maw

Approximate Drop Rate: Unknown

Drop: Sha of Pride [??+]

Zone: Siege of Orgrimmar (Flexible, Normal or Heroic)

Approximate Drop Rate: 1 in 125

Pet Battle: [25] Isle of Thunder

Pet Battle: [25] The Waking Shores

Drop: Sha of Pride [??+]

Zone: Siege of Orgrimmar (LFR or Flexible)

Approximate Drop Rate: Unknown

Achievement: Time To Open a Pet Store

Category: Pet Battles

Scenario: Island Expeditions

Approximate Drop Rate: Unknown

Pet Battle: [13-14] Searing Gorge; [15-16] Burning Steppes

Drop: Curious Top Hat

Zone: Zaralek Cavern

Drop Rate: 1 in 1

Pet Battle: [25] The Waking Shores

Pet Battle: [1] Dornogal; [25] The Ringing Deeps

Pet Battle: [25] Revendreth

Achievement: WoW's 10th Anniversary

Category: Feats of Strength

Treasure: Wayward Motes of Nasz'uro

Zone: Ohn'ahran Plains, Thaldraszus, The Azure Span, The Waking Shores, The Forbidden Reach

Drop: Grand Proctor Beryllia [??+]

Zone: Sanguine Depths (Mythic)

Approximate Drop Rate: Unknown

Drop: Karokta [??+]

Zone: Zaralek Cavern

Approximate Drop Rate: Unknown

Vendor: Chachi the Artiste

Zone: Revendreth

Covenant: Venthyr (Renown 27)

Cost: 1500 30 (unlimited supply)

Pet Battle: [25] Zaralek Cavern

Vendor: Trading Post

Zone: Orgrimmar (H), Stormwind (A)

Cost: 200 (unlimited supply)

World Event: Midsummer Fire Festival

Vendor: Midsummer Merchant (Horde) / Midsummer Supplier (Alliance)

Cost: 350 (unlimited supply)

Pet Battle: [25] Stormheim

Pet Battle: [25] Isle of Thunder

Scenario: Island Expeditions

Approximate Drop Rate: Unknown

World Event: Feast of Winter Veil

Item: [Gaily Wrapped Present] (found under Winter Veil tree)

Contains: 1 in 4 options

Drop: Madness of Deathwing [??+]

Zone: Dragon Soul

Approximate Drop Rate: Unknown

Achievement: Khaz Algar Safari

Category: Collect

Pet Battle: [25] Revendreth

Vendor: Gnawbles

Zone: The Ringing Deeps

Cost: 1 (unlimited supply)

Drop: Manifestation of Wrath [61], Prideful Hulk [57-60]

Zone: Revendreth

Approximate Drop Rate: Unknown