Patriot Viper Elite II DDR4 4GB(1 x 4GB) 2666MHz Single Memory Module 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
Axiom 4GB DDR4-2666 SODIMM for Lenovo - 4X70R38789 at Amazon.com
Amazon.com: HP Stream Laptop PC 11.6" Intel N4000 4GB DDR4 SDRAM 32GB eMMC Includes Office 365 Personal for One Year, Jet Black : Electronics
Crucial 4GB DDR4 PC4-21300 2666MHz SDRAM Memory Laptop Memory Model CT4G4SFS8266 at Amazon.com
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