Kingston Technology 2 GB Unbuffered System Specific Memory Model 2 Not a kit (Single) DDR2 667 (PC2 5300) 200-Pin SO-DIMM KTH-ZD8000B/2G at Amazon .com
Komputerbay 8 GB (2 x 4GB) PC2-6400 DDR2-800 SoDIMM Dual Channel Laptop Memory Kit at Amazon.com
8GB [2x4GB] DDR2-800 (PC2-6400) RAM Memory Upgrade Kit for The Dell Latitude E6400 (Genuine A-Tech Brand) at Amazon.com