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
DDR2 RAM 2GB 800 MHz 2RX8 PC2 6400S PC2 6400 1.8V 200 pin Non-ECC Unbuffered SODIMM Samsung Chip Memory for Laptop Upgrade, Green, Single 2GB at Amazon.com
parts-quick 4GB 2 X 2GB PC2-5300F 667MHz 240 pin DDR2 SDRAM ECC Fully Buffered FB DIMM Server Memory for IBM System x3400 7973, 7974, 7975, 7976-x at Amazon.com