You have to be quick. You only have 7 hours to pick up all the Alan Wake games on Steam, which is 75% off until 4PM BST (9AM approx in eastern America) (check time zones for conversion).
After the time ends, the franchise should go back to 50% off, so get it while it's cheap!
http://store.steampowered.com/sub/15407/
You're looking at just under £8/$10 for the entire franchise if you buy it as a bundle.
HURRY GUYS!
Charlie