Originally Posted by Motoki 
There's a whole site devoted to that sort of thing. http://www.steamprices.com
You can compare regions and see what is fair priced (ie converts to be near the same amount) and then also the top savings (better priced in your region) and total rip-offs (worse priced in your region).
Awesome link, thanks. Makes life a little easier. Also got in on the deal above!