iMac (2007-2009) Memory Installation Video - YouTube
Apple A1225 24" iMac 9.1 Core 2 Duo 3.06GHz 640GB HDD - Bad Optical Drive -As Is | RecycledGoods.com
Apple iMac 9,1 A1224 20" Core 2 Duo P7350 2.0GHz 2GB RAM 160GB HDD El Capitan | eBay
24" iMac 9.1, Intel Core 2 Duo@2.93GHz, 4GB RAM, DVD-RW, No Mac OS x Installed , 1TB HDD, with Power Cable, Appears To Function. [94031+167]
iMac | 2.66 GHz Core 2 Duo | 20 Inch | Early 2009 - Techable.com
iMac RAM for Model 9.1 | Early Mid 2009 | DDR3-1066MHz | MacMemory.com
Apple iMac "Core 2 Duo" 2.66 20-Inch (Early 2008) , 320 GB Hard Drive, 2 GB RAM - Imagine41
iMac Memory for Models 10.1 and 11.1 | 16GB (4GBx4) | MacMemory.com
iMac (2009) RAM & Storage Upgrades
Timetec 8GB KIT(2x4GB) Compatible for Apple DDR3 1067MHz / 1066MHz PC3-8500 CL7 for Mac Book, Mac Book Pro, iMac, Mac Mini (Late 2008, Early/Mid/Late 2009, Mid 2010) SODIMM Memory MAC RAM Upgrade
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET