The entire Deus Ex series is 75 percent off on Steam through June 25, as individual titles or as a package deal. Deus Ex: Human Revolution
(Augmented Edition) is $7.50, and the original Deus Ex
Game of the Year edition and Invisible War
each run $2.50.
Grab all of these, plus The Missing Link DLC, Tactical Enhancement Pack and Explosive Mission Pack DLCs for Human Revolution
for $15 in the collection sale.