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
TEAMGROUP Elite DDR4 8GB Single 2666MHz PC4-21300 CL19 Unbuffered Non-ECC 1.2V UDIMM 288 Pin PC Computer Desktop Memory Module Ram Upgrade - TED48G2666C1901 - (1x8GB) Single at Amazon.com
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