2GB [2x1GB] DDR2-533 (PC2-4200) RAM Memory Upgrade Kit for The Apple PowerBook G4 (1.67GHz, 15-inch, PC4200-DDR2) (Genuine A-Tech Brand) at Amazon.com
CMS 2GB (2X1GB) DDR2 4200 533MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with IBM Lenovo® Thinkpad T43P Notebook Series Ddr2-Pc4200 - A59 at Amazon.com