Apple iMac Core 2 Duo 2 GHz 4GB RAM 120GB SSD El Capitan | refurbishtech.net
Apple iMac 21.5-inch Desktop A1311 3.06GHz Core i3 4GB RAM 500GB HD DVD SD | eBay
iMac Memory for Model 13.2 to 15.1| DDR3-1600MHz | 4GB | MacMemory.com
A-Tech 4GB RAM for Apple MacBook Pro (Early/Late 2011), iMac (Mid 2010, Mid 2011, Late 2011), Mac Mini (Mid 2011) | DDR3 1333MHz PC3-10600 204-Pin SODIMM Memory Upgrade Module at Amazon.com