Celebrating the inclusion of Penumbra Overture in the Humble Indie Bundle, Frictional Games is running a pre-order sale on Amnesia: The Dark Descent. The game is 50% off until May 11th, bringing the price to just $10. This will will probably be the cheapest way to get your hands on Amnesia this year. Should Amnesia: The Dark Descent reach 2,000 pre-orders by May 31, Frictional will add a developer commentary track to the game.
Pre-order here: http://www.amnesiagame.com/#buy.