Inspired by the cheap DX:HR on Steam at the moment (http://www.hotukdeals.com/deals/deus-ex-human-revolution-director-s-cut-3-24-steam-2514966), thought I'd pop this up here. GMG have all Deus Ex PC games apart from the most recent one for £4.99 here, which is absolutely worth the outlay and also 79p cheaper than Steam :)
All games register on Steam:
Deus Ex: Human Revolution - Director's Cut
Deus Ex: The Fall
Deus Ex: Game of the Year Edition
Deus Ex: Invisible War
PS You'll need to log in to see this price.