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
2020 2019 5K 27 inch IMAC 64GB 32GB 16GB 8GB DDR4 2666 2667 apple all-in-one PC memory RAM - AliExpress
Micron 64GB (2 x 32GB) DDR4 2666MHz SODIMM Memory Upgrade Kit Compatible with 27 inch iMac (iMac19,1 iMac20,1 iMac20,2) - Walmart.com
16Gb Ddr4-2666Mhz Pc4-21300 So-Dimm Memory For Apple 27" – TeciSoft
16GB Memory Upgrade for 21.5-inch iMac 2019
A-Tech 64GB Kit (2x32GB) RAM for Apple iMac & Mac Mini (2018, 2019 & 2020) | DDR4 2666 MHz SODIMM PC4-21300 / PC4-21333 260-Pin SO-DIMM Memory Upgrade at Amazon.com
Crucial 16GB DDR4-2666 SODIMM Memory for Mac | CT16G4S266M | Crucial.com
Apple Memory Module 16GB DDR4 2666MHz SO-DIMMS (2x8GB) - Apple