Apple iMac 27" All-In-One Computer, Intel Core i5, 8GB RAM, 2TB HD, Mac OS Sierra, MNED2LL/A - Walmart.com
Timetec 32GB KIT(2x16GB) Compatible for Apple DDR4 2666MHz / 2667MHz for Mid 2020 iMac (20,1/20,2) / Mid 2019 iMac (19,1) 27-inch w/Retina 5K, Late 2018 Mac Mini (8,1) PC4-21333 /PC4-21300 MAC RAM at Amazon.com
Amazon.com: Apple iMac (21.5-inch, 8GB RAM, 1TB Storage) - Previous Model : Electronics
4GB [2x2GB] DDR2-667 (PC2-5300) RAM Memory Upgrade Kit for The Apple iMac 7,1 (20-inch, 2.0GHz, MA876LL/A) Intel Core 2 Duo (Genuine A-Tech Brand) at Amazon.com
Best memory for 2020 iMac (27-inch): upgrade your RAM today | iMore
Teardown, testing discover Apple made 2017 iMacs easier for users to upgrade | AppleInsider
Will this RAM work on iMac 27 inch 5k late 2015 model/ : r/applehelp