G.SKILL Ripjaws V Series (Intel XMP) DDR4 RAM 16GB (2x8GB) 2400MT/s CL15-15-15-35 1.20V Desktop Computer Memory UDIMM - Red (F4-2400C15D-16GVR) at Amazon.com
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