I just bought 4 gig's of ram. I bought the following for $61.99.
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231166I finagled them out of a $10 gift card because something I bought from them went down in price after three weeks. I wanted the cash, knowing full well they would offer a gift card which I would gladly accept of course...hehehe. Plus, I used one of their email list 10% coupons ($8.00 for me) on all desktop memory.
After a couple of months of waiting and planning and even scheming, I got the price down to what I was willing to pay for some pretty decent ddr2.