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
TECMIYO DDR2 PC2-6400 DDR2 800 4GB Kit (2x2GB) Non ECC Unbuffered 1.8V CL6 200-Pin Sodimm Laptop Memory Module 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
HP 1GB DDR2 SDRAM Memory Module - 1GB (1 x 1GB) - 667MHz DDR2-667/PC2-5300 - ECC - DDR2 SDRAM - 240-pin at Amazon.com