Crucial 2GB Single DDR2 667MHz (PC2-5300) CL5 SODIMM 200-Pin Notebook Memory Module CT25664AC667 at Amazon.com
URAM DDR2 SDRAM 2GB 667MHz PC2 5300S PC2 5300 1.8V 200 pin Non-ECC SODIMM Samsung Chip Laptop Memory RAM for Notebooks with Intel and AMD Systems, and for iMac,MacBook,MacBook Pro and Mac
2GB RAM Memory for Asus F3Sr AP089C Black Diamond Memory Module DDR2 SO-DIMM 200pin PC2-5300 667MHz Upgrade System Specific Memory - Newegg.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