8GB kit (2x4GB) DDR3 1066 SODIMM for Apple iMac (2009), MacBook Pro (2 – Aplus Technology
16GB 2x8gB RAM Memory for Macbook Pro MacMini iMac 2009 2010 DDR3 1066 PC3 8500 | eBay
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
8GB KIT 2X 4GB Apple iMac 2.0GHz 20" Mid 2009 2.66GHz 20" MB417LL/A Early 2009 2.66GHz 24" MB418LL/A Early 2009 2.66GHz 27" Late 2009 2.8GHz 27" Late 2009 2.93GHz 24" MB419LL/A Early
How to Upgrade Memory in a Late 2009 21.5-inch or 27-inch iMac - YouTube