How to upgrade RAM in the (Mid 2017) 5K iMac and save up to ~$900 [Video] - 9to5Mac
Refurbished 27-inch iMac 3.8GHz 8-core Intel Core i7 with Retina 5K display - Apple
OWC can double or quadruple the RAM in 27-inch iMac 5K | Cult of Mac
How to upgrade iMac (2020) RAM and save up to $2000 - 9to5Mac
A-Tech 64GB (4x16GB) RAM for Apple iMac 2017 27 inch Retina 5K | DDR4 2400MHz SODIMM PC4-19200 2Rx8 1.2V 260-Pin SO-DIMM Memory Upgrade Kit at Amazon.com
Memory Upgrades for 2019-2020 iMac 27-Inch - Up to 128GB
How to upgrade the RAM on the 27-Inch iMac (2020) | AppleInsider
Install memory in an iMac - Apple Support
Apple A Grade Desktop Computer 27-inch iMac A2115 2019 MRR02LL/A 3.6 GHz Core i9 (I9-9900K) 16GB RAM 2 TB SSD Storage Mac OS Include Keyboard and Mouse - Walmart.com
Apple iMac with Retina 5K display - all-in-one - Core i7 3.8 GHz - 8 GB - SSD 512 GB - LED 27" - US - MXWV2LL/A - All-in-One Computers - CDW.com