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
Kingston Technology 1 GB DIMM Memory 2 667 MHz (PC2 5300) 240-Pin DDR2 SDRAM Single (Not a kit) KTD-DM8400B/1G at Amazon.com
Hynix 4GB 4 x 1GB PC2-5300U DDR2 667 Non-ECC Unbuff Memory Kit HYMP512U64CP8-Y5 at Amazon.com