Amazon.com: OWC 16GB (2 x 8GB) PC19200 DDR4 2400MHz SO-DIMMs Memory Compatible with 27" iMac w/Retina 5K (Mid 2017), Mac Mini (Late 2018), and Compatible PCs (OWC2400DDR4S16P) : Everything Else
Crucial 8GB DDR4-2666 SODIMM Memory for Mac | CT8G4S266M | Crucial.com
OLOy DDR4 RAM 32GB (2x16GB) 2666 MHz CL19 1.2V 260-Pin Laptop Gaming SODIMM Upgrade for 2019/2020 iMac 27-inch with Retina 5K Display, Late 2018 Mac Mini(MD4S162619MZDC) at Amazon.com
Crucial 16GB Single DDR4 2400 MT/s (PC4-19200) DR x8 SODIMM 260-Pin for Mac - CT16G4S24AM - Walmart.com
NEMIX RAM 32GB Upgrade Kit (2x16GB) DDR4 2666MHz PC4-21300 SODIMM Memory Compatible for Apple iMac Mid 2020 iMac (20,1 / 20,2) / Mid 2019 iMac (19,1) 27-inch w/Retina 5K, Late 2018 Mac Mini (8,1) at Amazon.com
Crucial CL19 PC4-21300 1x32GB DDR4 2666Mhz For Mac RAM Memory Green| Techinn
Crucial 8GB DDR4-2666 SODIMM Memory for Mac | CT8G4S266M | Crucial.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
Apple Memory Module 16GB DDR4 2400MHz SO-DIMM (2x8GB) - Apple