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
Timetec Hynix IC 16GB Compatible for Apple 2019 iMac 27-inch w/Retina 5K Display, Late 2018 Mac Mini DDR4 2666MHz PC4-21300 2Rx8 CL19 1.2V SODIMM Memory RAM Upgrade (16GB) : Amazon.in: Computers &
Memoria Corsair Mac SO-DIMM 32 GB (4x 8 GB) DDR4 2666 MHz CL18 - Memoria PC Corsair en LDLC | ¡Musericordia!
Amazon.com: OWC 8GB (2 x 4GB) PC19200 DDR4 2400MHz SO-DIMMs Memory Compatible with Mac Mini (Late 2018), 27" and 21.5" iMac (Mid 2017), and Compatible PCs (OWC2400DDR4S08P) : Everything Else
8GB DDR4-2400MHz PC4-19200 SO-DIMM Memory for Apple 21.5" iMac with Retina 4K Display Mid 2020 by NEMIX RAM System Specific Memory - Newegg.ca
How to upgrade RAM in the (Mid 2017) 5K iMac and save up to ~$900 [Video] - 9to5Mac
64GB Memory Upgrade for 2019-2020 Apple iMac (27-inch)
Apple iMac compatible RAM and SSD upgrades | Upgradeable