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
Corsair VENGEANCE LPX DDR4 16GB (2x8GB) 3200MHz CL16 Intel XMP 2.0 iCUE Compatible Computer Memory - Black (CMK16GX4M2E3200C16) at Amazon.com