Greenman gaming has a daily deal at the moment that is 75% off on The Elder Scrolls V: Skyrim, and 66% off Oblivion game of the year deluxe edition, this is incredibly cheap and the deal is only up for 24 hours I believe so I would hurry up if I were you.
http://www.greenmangaming.com/deal-of-the-day/
(They're both steam versions ofcourse).