Crucial 16GB Kit (8GBx2) DDR4 2133 MT/s (PC4-17000) DR x8 SODIMM 260-Pin Memory - CT2K8G4SFD8213 at Amazon.com
NeweggBusiness - G.SKILL Ripjaws X Series 16GB (2 x 8GB) DDR3 2133 (PC3 17000) Desktop Memory Model F3-2133C9D-16GXH
Adamanta 16GB (1x16GB) DDR4 2133Mhz (or 2400MHz or 2666MHz or 2933MHz or 3200MHz) PC4-17000 SODIMM 2Rx8 CL15 1.2v Non-ECC Unbuffered Notebook DRAM RAM at Amazon.com