[PC, Mac] Blizzard Holiday Sale: WoW War Within Epic Ed. $93.95 (30% off), Starcraft $10.95 (50% off) @ Battle.net

If you were waiting for the expansion to drop in price, this is it. News source.

World of Warcraft
The War Within, Base Edition: up to 30% off
The War Within, Heroic Edition: up to 30% off
The War Within, Epic Edition: up to 30% off
Cataclysm Classic, Heroic Edition: up to 50% off
Cataclysm Classic, Epic Edition: up to 50% off
Cataclysm Classic, Heroic to Epic Upgrade: up to 50% off
Select Pets: up to 50% off
Select Mounts: up to 50% off
Select Toys: up to 50% off
Select Transmogs: up to 50% off
Select Character Servies: up to 30% off
Character Boosts: up to 33% off

Call of Duty
Call of Duty: Black Ops 6, Standard Edition: up to 25% off
Call of Duty: Black Ops 6, Vault Edition: up to 20% off
Call of Duty: Modern Warfare III: up to 50% off
Call of Duty: Modern Warfare II: up to 50% off
Call of Duty: Vanguard: up to 60% off
Call of Duty: Black Ops Cold War: up to 67% off
Call of Duty: Modern Warfare: up to 67% off
Call of Duty: Black Ops 4: up to 67% off
Call of Duty: Black Ops 4, Digital Deluxe: up to 60% off
Call of Duty: Modern Warfare 2 Campaign Remastered: up to 25% off

Diablo
Diablo IV Standard Edition: up to 40% off
Diablo IV Expansion Bundle: up to 35% off
Vessel of Hatred Standard Edition: up to 25% off
Vessel of Hatred Deluxe Edition: up to 25% off
Vessel of Hatred Ultimate Edition: up to 25% off
Diablo II: Resurrected: up to 67% off
Diablo III Standard Edition: up to 50% off
Diablo III Reaper of Souls: up to 50% off
Diablo III Battle Chest: up to 33% off
Diablo III Rise of the Necromancer: up to 33% off
Diablo III Eternal Collection: up to 25% off
Diablo: Hellfire: up to 20% off
Free Trial: While you’re shopping the sale, take advantage of the Diablo IV free trial to check out the Spiritborn class and the non-expansion content of Diablo IV!

StarCraft
SCR Cartooned Upgrade: up to 25% off
StarCraft Remastered: up to 50% off
SCR Cartooned Bundle: up to 30% off

Blizzard Arcade Collection: up to 50% off