Kingston ValueRAM 4GB 667MHz DDR2 ECC CL5 DIMM (Kit of 2) Desktop Memory at Amazon.com
4GB 2 X 2GB Memory for Dell Optiplex 320 330 740 745 755 PC2-5300 667MHz RAM (PARTS-QUICK ® Brand) at Amazon.com
Corsair Apple MAC Memory 2GB (2 X 1GB) PC2-5300 667MHz 200-pin DDR2 SODIMM Laptop Memory Kit - VSA2GSDSKIT667D2 at Amazon.com
OWC 4GB (2 x 2GB) PC5300 DDR2 667MHz SO-DIMMs Memory Compatible with MacBook, MacBook Pro, iMac, Mac Mini Core 2 Duo Models (OWC5300DDR2S4GP)
2GB Kit (2 x 1GB) DDR2 PC2-5300 200 pin 667MHz SO-DIMM Memory for Apple MacBook 13 inch 3rd Generation.(PARTS-QUICK Brand) Equivalent to MA369G/A, MA751G/A at Amazon.com
IBM 8GB DDR2 SDRAM Memory Module - 8GB (2 x 4GB) - 667MHz DDR2-667/PC2-5300 - ECC - DDR2 SDRAM - 240-Pin DIMM 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