Micron DDR4 SODIMM (1 x 8GB 2133MHz (MTA16ATF1G64HZ-2G1A2) SODIMM) at Amazon.com
Crucial Memory Bundle with 32GB (2 x 16GB) DDR4 2666MHz SODIMM Upgrade kit CT2K16G4SFD8266 Compatible with iMac Retina 5K 27-inch 2019 (iMac19,1) and Mac Mini 2018 (Macmini8,1) at Amazon.com
Patriot Signature Line Series DDR4 16GB (1 x 16GB) 3200MHz SODIMM (1 Rank Single-Sided Module) at Amazon.com