The flash memory company wants to start out small in the RAM market before moving up to 3200 MHz options for gamers and enthusiasts.
https://www.notebookcheck.net/Lexar-is-making-DDR4-RAM-sticks-now-starting-at-19-USD-for-a-4-GB-module.477174.0.html
In the meantime Apple charges more than 7 times as much for 8GB upgrade of soldered chip (200$). 😞