Was looking for DDR4-3600 but found this Patriot Viper DDR4-3733 for less:
https://www.amazon.com/Patriot-Vi…op?ie=UTF8
From the reviews, looks like people are getting anywhere from 3400 – 3733 actual speeds depending on CPU/motherboard (Ryzen users too). Will give it a shot in my 2700X / X370 build.
The DDR4-3400 version (CL16) is $10 cheaper: