Square Enix, EIDOS and Steam are offering the entire Deus Ex Collection with a 75% discount until Monday, June 25th.
Deus Ex Collection originally featured the first two titles, but the pack has been updated and it now includes Deus Ex: Human Revolution and all of its DLC packs, and will cost you 13.74 euros (or £10)
For those that wish to buy it, you can find it here.
So if you enjoy the Deus Ex games now is the time to buy them all!