TECMIYO DDR2 PC2-6400 DDR2 800 4GB Kit (2x2GB) Non ECC Unbuffered 1.8V CL6 200-Pin Sodimm Laptop Memory Module at Amazon.com
G.Skill 4GB DDR2 PC2-8500 1066MHz TT (PI) Black Series (5-5-5-15) Dual Channel kit at Amazon.com
Kingston 2 GB DDR2 SDRAM Memory Module 2 GB (1 x 2 GB) 800MHz DDR2800/PC26400 DDR2 SDRAM KTD-INSP6000C/2G at Amazon.com
Amazon.com: 8GB 2 X 4GB DDR3 PC3-8500 1066MHz SODIMM Memory RAM for Apple iMac Intel Core 2 Duo 20" inch 24" inch (Early 2009) Equivalent to MC016G/A (PARTS-QUICK BRAND) : Electronics