iMac with Retina 5K Display 2014/2015 Memory Upgrades
Timetec 32GB KIT(4x8GB) Compatible for Apple DDR3L 1600MHz PC3L-12800 CL11 for iMac (Mid 2011, Late 2012, Late 2013, Late 2014 Retina 5K, Mid 2015 Retina 5K) SODIMM Memory Module MAC RAM Upgrade at Amazon.com
Apple iMac 21.5" - Mid 2014 Reviews, Pros and Cons | TechSpot
16GB Kit 2 x 8GB Memory for Apple iMac Retina 5K 27 inch (Late 2014) Core i5 / i7 DDR3L 1600MHz PC3L-12800 SODIMM RAM (PARTS-QUICK Brand) at Amazon.com
NEMIX RAM 32GB 4x8GB DDR3L-1600 Memory for Apple iMac Retina 27" Late 2014 & Mid 2015 System Specific Memory - Newegg.com
Apple iMac 14,4 - 21.5" 2014 - Core i5-4260U 1.40GHz 8GB RAM 500GB HDD Very Good | eBay