Apple iMac 21.5" - Core i7 3.1GHz (Late 2012) 16GB RAM 1TB Fusion - Very Good | 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
Refurbished: Apple iMac 21.5-Inch "Core i5" 2.9GHz (Late 2012) A1418 MD094LL/A 8GB RAM 1TB HDD NVIDIA GT 650M MacOS MOJAVE USB Keyboard & Mouse Grade B - Newegg.com