How to Upgrade RAM in Your HP Laptop (with RAM underneath keyboard) - YouTube
CMS 4GB (1X4GB) DDR2 6400 800MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with HP/Compaq® Elitebook 2530P, 2730P, 6930P, 8530P 8730W - A42 at Amazon.com
Seifelden 8GB (2X4GB) Memory RAM for HP EliteBook 2530P Laptop Memory Upgrade - Walmart.com
HP Laptop EliteBook Intel Core 2 Duo SL9400 (1.86GHz) 4GB Memory 250GB HDD Intel GMA 4500MHD 12.1" Windows XP Professional (available through downgrade rights from Genuine Windows 7 Professional) 2530 - Newegg.com