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
CMS 4GB (1X4GB) DDR4 19200 2400MHZ NON ECC SODIMM Memory Ram Compatible with Apple IMAC Retina 5K, 27-inch (2017) - C105 - Walmart.com
Crucial 32GB PC4-21300 260-pin DDR4 SDRAM SODIMM for iMac, Mac (CT32G4S266M)
128GB 4X32GB DDR4 2666 Memory G.SKILL RAM for Apple iMac 5k 19,1 2019 Upgrade | eBay
Amazon.com: OWC 32GB (2 x 16GB) PC19200 DDR4 2400MHz SO-DIMMs Memory Compatible with Mac Mini (Late 2018), 27" and 21.5" iMac (Mid 2017), and Compatible PCs (OWC2400DDR4S32P) : Everything Else
OWC 16.0GB (8GB x 2) 2400MHz DDR4 SO-DIMM... at MacSales.com
Amazon.com: A-Tech 32GB RAM for Apple iMac & Mac Mini (2018, 2019 & 2020) | DDR4 2666 MHz SODIMM PC4-21300 / PC4-21333 260-Pin SO-DIMM Memory Upgrade : Electronics