4GB 2X2GB NEMIX RAM Memory for Apple iMac Late 2009 - Newegg.com
Early 2009 model iMac Computer, DDR3 8GB (2x4GB) RAM Replacement - YouTube
Apple iMac 27-Inch "Core i7" 2.8GHz (Late 2009) A1312 MC507LL/A 16GB R – Coretek Computers
Timetec 16GB KIT(4x4GB) Compatible for Apple DDR3 1067MHz / 1066MHz PC3-8500 CL7 Dual Rank for iMac (Late 2009 21.5-inch / 27-inch) SODIMM Memory MAC RAM Upgrade for iMac 10,1 and iMac 11,1 at Amazon.com
Memory Upgrades for Apple iMac 2009 - Up to 32GB
CMS 8GB (2X4GB) DDR3 8500 1066MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® iMac Core 2 Duo 3.06 21.5-Inch (Late 2009) - A35 at Amazon.com
Install memory in an iMac - Apple Support
Apple iMac 21.5-inch Late 2009 - 3.33GHz Core 2 Duo Desktop RAM Memory | Kingston