Here is a few examples
Max Payne 3 75% off
Assassin's Creed 1,2,Brotherhood all 75% off
Assassin's Creed Revelations 50% off
Assassin's Creed Complete (60% off save more this way - does not contain AC3)
Driver San Francisco 75% off
Witcher EE 75% off (£1.75 or around $2.60)
Darkness II 70% off (save more by buying the 4 pack send to your friends :P)
LA Noire Ordinary/Complete both 70% off
Sacred 2 Gold (both Fire and Ice and Fallen Angel) 70% off
Borderlands GOTY 75% off
Darksiders II 66% off
Alan Wake 50% off (But if you goto GOG.com you can buy 5 games for $10 and one is Alan Wake so best get there :P)
Civilization V 60% off
Dishonored 50% off
Skyrim 50% off
Fallout NV 50% off
Borderlands 2 25% off (I know sucks - think Amazon.com has it cheap will check)
EDIT: Yep correct about Borderlands 2 being cheaper on Amazon.com, non Americans can still buy from there.
Just your normal name and address, except for Zip Code (aka Post Code) and State. Use real State and Zip Code in that state and it will accept your purchase and you can get your Key with a download link in your account - not sure if its steam redeemable or not.
Either way be wary some Credit Card companies will charge a small fee for overseas purchases.
[Edited by DABhand, 11/23/2012 3:13:52 PM]
Just picked up MassEffect the series which is Mass effect 1 and Mass Effect 2 for 75% off on Steam.
hmm....wonder if gamersgate and steam are competing.....some of the prices you list look about the same.
SOme stuff on steam although you have to look.....is at 90% off....they dont seam to put these ont he main pages though.