Apple iMac All-In-One 13,1 A1418 21.5" 2012 i5-3330S 2.70 GHz 8GB RAM Few Left ! | eBay
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
2012 21.5-Inch Apple iMac Review: Slim, Sleek, And Stylish, But Far From Shallow | TechCrunch
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
A-Tech 32GB Kit (4x8GB) RAM for Apple iMac (Late 2012, Late 2013, Late 2014, Mid 2015) | DDR3 1600MHz SODIMM PC3-12800 204-Pin SO-DIMM Max Memory Upgrade at Amazon.com