Micron 16GB DDR4 SDRAM Memory Module at Amazon.com
GeIL Orion DDR4 RAM, 16GB (8GBx2) 3200MHz 1.35V XMP2.0, Intel/AMD Compatible, Long DIMM High Speed Desktop Memory, Hardcore Immersive Gaming/Multimedia Content Creation/Quality Live Streaming at Amazon.com
Hynix 16GB DDR4 PC4-19200 2400MHZ ECC REG DIMM Model HMA82GR7AFR8N-UH at Amazon.com
16GB DDR4-2666 PC4-21300 ECC SODIMM Compatible with Synology D4ECSO-2666-16G Memory Upgrade Module by NEMIX RAM 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