Amazon.com: Corsair Vengeance LPX 64GB (2 X 32GB) DDR4 3000 (PC4-24000) C16 1.35V Desktop Memory - Black : Electronics
Corsair VENGEANCE LPX DDR4 64GB (2x32GB) 3200MHz CL16 Intel XMP 2.0 Computer Memory - Black (CMK64GX4M2E3200C16) at Amazon.com
OWC 64GB (2 x 32GB) PC21300 DDR4 2666MHz SO-DIMMs Memory Compatible with Mac Mini 2018, iMac 2019 and up, Dell, HP, Lenovo, ASUS and Compatible PCs (OWC2666DDR4S64P) at Amazon.com