When it's time to upgrade, I get my ram from ramjet.com That's where I ordered ram for my bondi iMac G3400DV about a year ago, and it's also where I ordered ram for my new iBook just two weeks ago. In the most recent purchase, I think I paid around 70 dollars for 256mb ram, including shipping.
After having installed ram in two machines, I think that next time I'll read and reread the directions. I've found myself crossing my fingers as I wait for my computer to boot after installing ram. Don't mind being called a "gurrrrrrrrrrrrl", do some reading...