OLOy DDR4 RAM 8GB (1x8GB) 2400 MHz CL17 1.2V 260-Pin Laptop Gaming SODIMM for Intel (MD4S082417IZSC) at Amazon.com
Amazon.com: OWC 8GB (2 x 4GB) PC19200 DDR4 2400MHz SO-DIMMs Memory Compatible with Mac Mini (Late 2018), 27" and 21.5" iMac (Mid 2017), and Compatible PCs (OWC2400DDR4S08P) : Everything Else