In light of all the big announcements made by Bethesda during E3 earlier today, the developer and publisher has special promotions for multiple The Elder Scrolls games. Now is your chance to play catch up if you want to explore the other realms.
Catch Morrowind for P249 from it's original P499. You can get Oblivion at the same price, but with the price of P314, you get the Deluxe Edition. You can get Online now for P460, compared to its P920. Nothing on Skyrim, despite being Bethesda's poster boy, besides Fallout.
Some pro tip: Get these games just to include to your collection and install a bunch of mods to make them all pretty.