Crucial 2GB Single DDR2 667MHz (PC2-5300) CL5 SODIMM 200-Pin Notebook Memory Module CT25664AC667 at Amazon.com
Amazon.com: OWC 2GB PC5300 DDR2 667MHz SO-DIMM Memory Compatible with MacBook, MacBook Pro, iMac, and Mac Mini Models with Core 2 Duo Processor (OWC5300DDR2S2GB) : Everything Else
Amazon.com: 2GB 2 X 1GB PC2-5300 667MHz 240 pin DDR2 SDRAM ECC DIMM Desktop Server Memory for Dell PowerEdge SC440 (Parts-Quick Brand) : Electronics
Komputerbay 4GB 2X 2GB DDR2 667MHz PC2-5300 PC2-5400 DDR2 667 (240 PIN) DIMM Desktop Memor - Komputer Bay