CoreParts 16GB Memory Module 2133MHz DDR4 Major, KTH-PL421/16G, KTD-PE421/ 16G, KTL-T (2133MHz DDR4 Major DIMM) at Amazon.com
Hynix Original 16GB (1x16GB) Laptop Memory Upgrade Compatible for HP EliteBook 820 G3 DDR4 2133Mhz PC4-17000 SODIMM 2Rx8 CL15 1.2v DRAM Notebook Adamanta at Amazon.com