Timetec 64GB KIT(2x32GB) Compatible for Apple DDR4 2666MHz for Mid 2020 iMac (20,1 / 20,2) / Mid 2019 iMac (19,1) 27-inch w/Retina 5K Display, Late 2018 Mac Mini (8,1) PC4-21333 / PC4-21300 MAC RAM at Amazon.com
Buy iMac - Apple
Memory Upgrades for Apple iMac 2008 - Up to 6GB
Apple 24" iMac8,1 Core 2 Duo 2.8ghz 4gb RAM 320gb Hard Drive OSX 0.7 Early 2008 | eBay
iMac Memory for Model 8.1 | DDR2-800MHz |4GB | MacMemory.com
NEMIX RAM Compatible for 128GB (4x32GB) DDR4 2666MHz PC4-21300 SODIMM Memory Upgrade for Apple iMac Mid 2020 (iMac 20,1/20,2) / Mid 2019 (iMac19,1) 27-inch w/Retina 5K, Late 2018 Mac Mini 8,1 at Amazon.com
4GB -2x2GB Memory Ram Upgrade 20" Apple iMac-8.1 2.66GHz Core 2 Duo Early 2008 | eBay