Crucial Memory Bundle with 16GB (2 x 8GB) DDR4 2666MHz SODIMM Upgrade kit CT2K8G4SFS8266 Compatible with iMac Retina 5K 27-inch 2019 (iMac19,1) and Mac Mini 2018 (Macmini8,1) at Amazon.com
Amazon.com: Corsair Vengeance SODIMM 32GB (1x32GB) DDR4 2666 C18 1.2V for Intel 9th & 10th Gen Systems, Black : Electronics
A-Tech 8GB Module for MSI (Micro Star) GV62 8RD-200 Compatible DDR4 2666MHz PC4-21300 Non-ECC SODIMM 1.2V - Single Laptop & Notebook Memory RAM Stick (ATMS397712A34073X1) at Amazon.com
ADATA 8GB DDR4 2666 (PC4-21300) SODIMM 260-Pin Laptop Memory Module Single Rank 2666MHz 8GB at Amazon.com