32GB (2x16GB) DDR4-2666MHz PC4-21300 SO-DIMM Memory for Apple 27" iMac with Retina 5K Display Mid 2020 (iMac 20,1 iMac 20,2) by NEMIX RAM - Newegg.com
Crucial 32GB (2 x 16GB) DDR4 SDRAM Memory Kit - For iMac - 32 GB (2 x 16 GB) - DDR4-2666/PC4-21300 DDR4 SDRAM - CL19 - 1.20 V - Non-ECC - Unbuffered - 260-pin - SoDIMM CT2K16G4S266M 649528820976
Crucial 16GB DDR4-2400 SODIMM Memory for Mac | CT16G4S24AM | Crucial.com
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
A-Tech 32GB Kit (2x16GB) RAM for Apple iMac & Mac Mini (2018, 2019 & 2020) | DDR4 2666 MHz SODIMM PC4-21300 / PC4-21333 260-Pin SO-DIMM Memory Upgrade
Apple iMac MXWT2LL/A (2020) 27" All-in-One, 27" 5k Retina Display; Int – JBBwell
Apple Memory Module 32GB DDR4 2666MHz SO-DIMMS (2x16GB) - Apple
8GB DDR4-2666MHz PC4-21300 SO-DIMM Memory for Apple 27" iMac with Retina 5K Display Mid 2020 (iMac 20,1 iMac 20,2) by NEMIX RAM - Newegg.com