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
8GB (1x8GB) DDR4-2666MHz PC4-21300 1.2V SODIMM Laptop Memory by NEMIX RAM at Amazon.com
Kingston HyperX FURY 8GB 1600MHz DDR3 CL10 DIMM - Blue (HX316C10F/8) at Amazon.com
A-Tech 16GB Kit (2x8GB) RAM for Dell Latitude E7440, E7240, E6540, E6440, E5540, E5440 Laptop | DDR3/DDR3L 1600 MHz SODIMM PC3L-12800 Memory Upgrade at Amazon.com