Crucial 8GB Single DDR4 2400 MT/s (PC4-19200) SR x8 SODIMM 260-Pin for Mac - CT8G4S24AM System Specific Memory - Newegg.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