Adamanta 16GB (2x8GB) Apple Memory Upgrade DDR3L 1600MHz SODIMM Compatible for iMac (Mid 2011, Late 2012, Early/Late 2013, Late 2014, Mid 2015), MacBook Pro (Early/Late 2011, Mid 2012), Mac Mini at Amazon.com
Memory upgrade: Apple iMac 2012/2013/2014 (Howto)
Used 2012 Apple iMac 27" Core i5 3.2GHz 8GB RAM 1TB HDD MD096LL/A - Walmart.com
Apple iMac 21.5" Late 2012 Intel Core i5 2.90 GHz 1TB HDD 8GB RAM EMC 2544 A1418 | eBay
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
NEMIX RAM 16GB Kit (2x8GB Upgrade) DDR3-1600 SODIMM PC3-12800 for Apple MacBook Pro Mid 2012 / iMac Late 2012 / iMac 2013, Late 2014, Mid 2015, Mac Mini Late 2012 at Amazon.com
Review: 21.5-inch 2012 iMac takes two steps forward, one step back | Ars Technica
Install memory in an iMac - Apple Support
Teardown of New 21.5-inch iMac Reveals Glued Down LCD and Dual Microphones - MacRumors
The Case of the Late-2012 iMacs - MacStories
16GB -2x8GB Memory Ram Upgrade for 27" Apple iMac-13.2 Core i5 2.9GHz Late 2012 | eBay
APPLE IMAC LATE 2012 27" INCH i7 3.4GHz QUAD 16GB RAM 1 TB HD | eBay
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET