A-Tech for Apple 8GB Kit 2 x 4GB PC3-10600 Mac Mini iMac MacBook Pro Mid 2010 Late 2011 A1286 MD311LL/A A1297 MC511LL/A A1312 MC309LL/A A1311 MC812LL/A MC813LL/A MC814LL/A MC815LL/A A1347 Memory RAM
Apple iMac 21.5-inch Mid 2011 2.5GHz Intel Core i5 (MC309LL/A) – UNICOM, Inc.
Apple 21.5" iMac All in One Desktop Computer Core i5 4GB Ram 500GB HD OS High Sierra and WIFI Keyboard And Mouse - GRADE B
Crucial 4GB DDR3L-1333 SODIMM Memory for Mac | CT4G3S1339M | Crucial.com
Apple iMac 2011 Apple All-in-Ones-In - One Computers for sale | eBay
16GB Memory Upgrade Kit For Apple iMac 2010-2011
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