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 RAM at Amazon.com
Apple 21.5" Certified Refurbished iMac Desktop Intel Core i5 1.4GHz 8GB Memory 500GB HDD (2014) Silver MF883LL/A - Best Buy
iMac 14,4 (21.5-inch, Mid 2014) - Lincoln County School District #2
iMac (Retina 5K, 27-inch, Late 2014) - Technical Specifications
Best Buy: Pre-Owned Apple iMac 21.5-Inch Desktop "Core i5" 2.7GHz (Mid-2014) 8GB Memory 1000GB HDD ME086LL/A
Apple 21.5-inch iMac review | 2014 | Digital Trends
iMac 5K - 4790K, M295X - thermal compound + second SSD upgrade + Air Vents MOD | MacRumors Forums
Apple iMac (21.5-inch, 2014) review: A price cut for the 21-inch iMac makes it a mainstream machine - CNET
Differences Between Late 2013 and Mid-2014 Aluminum iMac: EveryMac.com