Magma Wave

Drop: Fyrakk Assault

Approximate Drop Rate: Unknown

Drop: Fyrakk Assault

Approximate Drop Rate: Unknown

Drop: Fiery Soul

Profession: Dragon Isles Engineering [50], Dragon Isles Jewelcrafting [40]

Approximate Drop Rate: Unknown

World Event: Midsummer Fire Festival

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

Cost: 350 (unlimited supply)

Vendor: Celestine of the Harvest

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

Cost: 250 (unlimited supply)

Drop: World Drop

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

Weather:  Elemental Storm (Fire)

Approximate Drop Rate:  Unknown

Vendor: Mythressa

Zone: Valdrakken

Cost: 1000 (unlimited supply)

Drop: Sulfuron Harbinger [??+]

Zone: Molten Core

Approximate Drop Rate: 1 in 20

Quest: By Time Fire be Purged! [60]

Zone: Thaldraszus

Pet Battle: [25] The Waking Shores; [25] The Azure Span; [25] Thaldraszus

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

Pet Store 

Drop: Ignis the Furnace Master [??+]

Zone: Ulduar

Approximate Drop Rate: Unknown

Pet Battle: [13-14] Searing Gorge

Quest: Pandaren Spirit Tamer [1]

Zone: Vale of Eternal Blossoms

Drop: Pandaren Spirit Pet Supplies

Approximate Drop Rate: 1 in 10

Scenario: Island Expeditions

Approximate Drop Rate: Unknown

World Quest: Combustible Vegetation [60]

Zone: The Forbidden Reach