RMSA3300ME78HBF-2666 16gb Pc4 2666MHz DDR4 So-Dimm Non-ECC 260 pin 1.2V Ram Memory for Laptop and All in One Desktop Computer (16gb Pc4 2666MHz DDR4 So-Dimm) at Amazon.com
Amazon.com: AddOn 16GB DDR4 SDRAM Memory Module - for Desktop PC - 16 GB (1 x 16 GB) - DDR4-2666/PC4-21300 DDR4 SDRAM - CL17-1.20 V - Non-ECC - Unbuffered - 260-pin - SoDIMM: Electronics
Crucial 16GB Single DDR4 2666 MT/s (PC4-21300) DR X8 SODIMM 260-Pin Memory - CT16G4SFD8266 at Amazon.com
Axiom 16GB DDR4-2666 SODIMM - AX42666S19B/16G at Amazon.com