Crucial RAM 8GB DDR4 2400 MHz CL17 Memory for Mac CT8G4S24AM at Amazon.com
Timetec 16GB Compatible for Apple 2017 iMac (27-inch w/Retina 5K, 21.5-inch w/Retina 4K / Non-Retina 4K) DDR4 2400MHz PC4-19200 CL17 SODIMM Memory MAC RAM Upgrade for iMac 18,1 / iMac 18,2 /
Amazon clears out Apple's latest Intel 21-inch 4K iMac with $399 discount, more from $949 - 9to5Toys
DATARAM 32GB Memory RAM Upgrade (2 x 16GB) DDR4 2400Mhz PC4-19200 CL17 SO DIMM Compatible with The Apple iMac Core i5 2.3 21.5-Inch (Mid-2017) 18,1 at Amazon.com
Memory upgrade compatibility list for iMac 2019-2020 | MacRumors Forums
OWC 32GB (4 x 8GB) 2400MHZ DDR4 SO-DIMM PC4-19200 Memory Upgrade for 2017 iMac 27 inch with Retina 5K Display- Buy Online in Antigua and Barbuda at Desertcart - 43091192.