Silicon Power DDR4 RAM 16GB (8GBx2) Turbine 3200MHz (PC4 25600) 288-pin CL16 1.35V UDIMM Desktop Memory Module (SP016GXLZU320BDA) at Amazon.com
OWC 16GB (2x8GB) ram Upgrade PC3-12800 DDR3L 1600MHz sodimm 204 Pin CL11 Memory Upgrade Kit Compatible with Late iMac, Mac Mini, and MacBook Pro Computer at Amazon.com
Crucial RAM 32GB Kit (2x16GB) DDR4 3200MHz CL22 (or 2933MHz or 2666MHz) Laptop Memory CT2K16G4SFRA32A at Amazon.com