Kingston ValueRAM 4GB 667MHz DDR2 Non-ECC CL5 DIMM (Kit of 2) Desktop Memory at Amazon.com
Crucial 4GB Single DDR2 667MHz (PC2-5300) CL5 SODIMM 200-Pin Notebook Memory Module CT51264AC667 at Amazon.com
4GB [2x2GB] DDR2-667 (PC2-5300) RAM Memory Upgrade Kit for The Apple iMac 7,1 (20-inch, 2.0GHz, MA876LL/A) Intel Core 2 Duo (Genuine A-Tech Brand) at Amazon.com
parts-quick 8GB (2 X 4GB) DDR2 Desktop Memory PC2-5300 240 pin 667MHz Non-ECC DIMM RAM at Amazon.com