G.Skill 8GB (2 x 4GB) Ripjaws V Series 288-Pin DDR4 SDRAM DDR4 2400 (PC4-19200) Intel Z170 Platform/Intel X99 Platform Desktop Memory Model F4-2400C15D-8GVR at Amazon.com
4GB (1x4GB) DDR4-2400MHz PC4-19200 1.2V SODIMM Memory for Laptop by NEMIX RAM at Amazon.com
Kingston Value (KVR16N11S8/4) RAM 4GB 1600MHz PC3-12800 DDR3 Non-ECC CL11 DIMM SR x8 Desktop Memory at Amazon.com
DATARAM HIGH Performance 4GB DDR4 PC4-19200 2400MHz 260PIN SO DIMM Memory RAM 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