Memory Upgrades for iMac w/ Retina 5K Display Late 2015
A-Tech 16GB (2x8GB) RAM for Apple iMac Late 2015 27 inch Retina 5K | DDR3L 1866MHz / 1867MHz PC3L-14900 1.35V 204-Pin SODIMM Memory Upgrade Kit at Amazon.com
OWC 8GB (2 x 4GB) PC12800 DDR3L 1600MHz SO-DIMMs Memory Compatible with 2011-2015 iMac, 2011-12 Mac Mini, and 2011-2012 MacBook Pro (Non-Retina Display) Models (OWC1600DDR3S08S) at Amazon.com
Apple iMac Retina 4K 21 .5 inch Late 2015 2.8GHz i5 16GB RAM 1.02 Fusión drive | eBay
Apple iMac 27" 2015 - i5 3.3GHz - 16GB RAM - 2TB HDD - Model Number MK782LL/A - Grade B Used - Walmart.com