How to Upgrade RAM on MacBook Pro, iMac & More | AVG
Third-Party RAM for 27-inch iMac Still Far More Affordable Than Apple's Checkout Upgrade Options - MacRumors
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
iMac Upgrade Guide for Intel iMacs
OWC 16GB (2x8GB) ram Upgrade PC3-12800 DDR3L 1600MHz sodimm 204 Pin CL11 Memory Upgrade Kit Compatible with Late iMac, Mac Mini, and MacBook Pro Computer at Amazon.com
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
2GB DDR2-667 (PC2-5300) RAM Memory Upgrade for The Apple iMac 7,1 (20-inch, 2.0GHz, MA876LL/A) Intel Core 2 Duo (Genuine A-Tech Brand) at Amazon.com
Upgrade your iMac's RAM in less than 5 minutes - YouTube
The New 2017 iMac: Notes & Tidbits on RAM - The Mac Observer