I wont be posting the details or any images but you can check out all four games via Steam:
http://store.steampowered.com/
Just click on the specials tab. Batman Arkam Asylum: Game of the Year Edition is the midweek madness deal and ends later today. you can get it for half price at $19.99 it's a bargain.
Morrowind, the third Elder Scrolls title is available for 75% off. At only $5, it's the bargain of the month as far as I'm concerned. It's the game of the year edition so you get the Bloodmoon and Tribunal expansions as well.
Oblivion is available for 60% off and costs $8.50 for that you get the original game plus the expansion The Shivering Isle which adds a whole new area to the game plus the Knights of the nine booster pack that adds 9 excellent mods to the game.
finally you can get Fallout 3 plus all five booster packs for 50% off That's only $19.99 All four games are excellent and should give many weeks of game play.
I'd loved to have given this post the time it deserves as the graphics for all four games are fantastic. Morrowind is the oldest of the four games, but the graphics are still excellent.
The three Bethesda tiles are amongst my favorite games of all time and I highly recommend to purchase at least one of them. If you prefer famtasy Oblivion or morrowind are must buys if you like post apocalyptic themes then Fallout 3 is for you. :) Fallout 3 has a new expansion for release later this year called Fallout Vegas. You can now preorder it via steam and get some additional content. :)