Yeah, they had the same deal a couple of months ago and I re-bought 1 & 2 then. For anyone that's interested, the New Vision mod really does breathe new life into the originals visuals:
http://www.moddb.com/mods/deus-ex-new-vision
For general Deus Ex mods:
http://www.moddb.com/games/deus-ex/mods