The LucasArts Adventure Pack, a collection of four classic LucasArts adventure games (Loom, The Dig, Indiana Jones and the Fate of Atlantis and Indiana Jones and the Last Crusade), is now available for $4.99 from Steam, and will remain so for the next 24 hours until the weekend begins. At that point, the price will go back up to $9.99.
(Edit: Thanks to TestType for pointing-out the mistake earlier. This campaign of misinformation is all part of my plan to become a pundit on Fox News. Pretend you believe me.)