Click on the Crucial link then Use code NLDHPCPQ425 for $25 off the price of basically any of Crucial's lineup of 512MB Memory chips. You must go through the lefthand Crucial advertisement on MyHPclub.com for this to work.
512MB PC2100 DDR CT6464Z335 $72 - $25 = $47
512MB PC2700 DDR CT6464Z265 $79 - $25 = $54
512MB PC3200 DDR CT6464Z403 $94 - $25 = $69
512MB PC2100 SODIMM CT6464X265 $147 - $25 = $122
NLDHPCPQ425 code doesn't work..... i tried it yesterday.