Darksiders & Red Faction Armageddon $1 (Steam, PC) BTA for Darksiders II & Red Faction Guerrilla @ Humble Bundle store
http://www.humblebundle.com/weeklyPay $1 or more and get:
Darksiders RRP $19.99 (Steam, PC) + Soundtrack
Red Faction: Armageddon RRP $19.99 (Steam, PC) + Path To War DLC + Soundtrack
Beat The Average and also get:
Darksiders II RRP $49.99 (Steam, PC)
Red Faction Guerrilla RRP $19.99 (Steam, PC) + Soundtrack