8GB 2X4GB RAM Memory for Compaq HP Business Notebooks Business Notebook 6730s Black Diamond Memory Module DDR2 SO-DIMM 200pin PC2-6400 800MHz Upgrade - Walmart.com
4GB (1x4GB) DDR2 800MHz PC2-6400 Single Stick 200-pin SODIMM Laptop Memory RAM 2Rx8 at Amazon.com
Crucial 4GB Single DDR2 800MHz (PC2-6400) CL6 SODIMM 200-Pin Notebook Memory Module CT51264AC800 at Amazon.com