Nanya 1GB DDR2 RAM PC2-5300 200-Pin Laptop SODIMM at Amazon.com
4AllDeals 1GB Memory RAM Upgrade for The Dell OptiPlex GX620 Desktop, Mini Tower, Small Form Factor and Ultra Small Form Factor (DDR2-400, PC2-3200) at Amazon.com
Komputerbay 8 GB (2 x 4GB) PC2-6400 DDR2-800 SoDIMM Dual Channel Laptop Memory Kit at Amazon.com