OWC 32GB (2 x 16GB) PC21300 DDR4 2666MHz SO-DIMMs Memory, Compatible with Mac Mini 2018, iMac 2019 and up, and Compatible PCs, (OWC2666DDR4S32P) at Amazon.com
OWC 32GB PC21300 DDR4 2666MHz SO-DIMM Memory Compatible with Mac Mini 2018, iMac 2019 and up, Dell, HP, Lenovo, ASUS and Compatible PCs (OWC2666DDR4S32G) at Amazon.com
Amazon.com: Crucial RAM 32GB DDR4 2666 MHz CL19 Memory for Mac CT32G4S266M : Everything Else
Crucial 32GB (2 x 16GB) 260-Pin DDR4 SO-DIMM DDR4 3200 (PC4 25600) Laptop Memory Model CT2K16G4SFRA32A - Newegg.com
Apple Memory Module 32GB DDR4 2666MHz SO-DIMMS (2x16GB) - Apple