Apple iMac (Late 2012) review (21.5- and 27-inch) | Macworld
Used: IMac (21.5-inch, Late 2012, 1TB, 8GB) | Mac-Ave
Install memory in an iMac - Apple Support
A-Tech 8GB RAM for Apple MacBook Pro (Mid 2012), iMac (Late 2012, Early/Late 2013, Late 2014, Mid 2015), Mac Mini (Late 2012) | DDR3 1600MHz PC3-12800 SODIMM 204-Pin Memory Upgrade at Amazon.com
Teardown of New 21.5-inch iMac Reveals Glued Down LCD and Dual Microphones - MacRumors
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
Apple iMac 21.5-inch (Late 2012), Core i5 2.9 GHz 8 GB RAM, 1 TB HD OSX Catalina | eBay