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Amazon.com: Crucial RAM 16GB DDR4 2400 MHz CL17 Memory for Mac CT16G4S24AM : Everything Else
Crucial 16GB Kit (8GBx2) DDR4 3200 MT/s (PC4-25600) CL22 SR x8 Unbuffered SODIMM 260-Pin Memory - CT2K8G4SFS832A at Amazon.com
G.Skill Trident Z RGB Series 16GB (2 x 8GB) 288-Pin SDRAM (PC4-28800) DDR4 3600 CL18-22-22-42 1.35V Dual Channel Desktop Memory Model F4-3600C18D-16GTZRX at Amazon.com