Crucial 16GB Kit (2 x 8GB) DDR3L-1600 SODIMM Memory for Mac | CT2K8G3S160BM | Crucial.com
OWC 64GB (2 x 32GB) PC21300 DDR4 2666MHz SO-DIMMs Memory Ram Module Compatible with Mac Mini 2018, iMac 2019 and up, Dell, HP, Lenovo, ASUS and Compatible PCs (OWC2666DDR4S64P) at Amazon.com
Corsair Memory Kit 16GB (2x8GB) DDR4 2400MHz SODIMM Memory, (2 x 8GB) at Amazon.com