Originally posted by: Geekish Thoughts
IRCj/k
There's always eBay.
Originally posted by: DaveSimmons
Buy.com, Amazon.com, chipsbits.com are all good if you compare prices.
For Windows you'll usually want to buy an OEM version (googlegear.com has pretty good prices) but be careful since some of the Pricewatch prices are for the license only with no install CD.
If you're still a student you can get much better prices either through your campus (often under $10) or through some vendor selling academic versions.