OEM Apple iMac 2014 RAM SK Hynix PC3L-14900S - 4GB x 2 - 8GB TOTAL | eBay
Memory upgrade: Apple iMac 2012/2013/2014 (Howto)
iMac with Retina 5K Display 2014/2015 Memory Upgrades
iMac with Retina 5K Display 2014/2015 Memory Upgrades
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
How to Upgrade/Install Memory in a 21.5-inch iMac (Late 2012– Mid 2014) iMac14,1 iMac14,3 - YouTube
CMS 32GB (4X8GB) DDR3 12800 1600MHz Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® iMac Retina 5K 27-Inch (Late 2014) Core I5/I7 - A6 at Amazon.com
Install memory in an iMac - Apple Support
Apple iMac (21.5-inch, 2014) review: A price cut for the 21-inch iMac makes it a mainstream machine - CNET