https://twitter.com/ArtemR/status/902306914733658113
"Essential tells us it's a minor glitch and it'll be back up soon."
EDIT: It's back: https://www.amazon.com/Essential-Phone-Unlocked-Display-Camera/dp/B074BWGRKH/
Seems to be back.
Just to mention. The Essential Phone could be bought from Amazon US. Amazon global shipping organize taxes and everything during checkout.
https://www.amazon.com/Essential-Phone-Unlocked-Display-Camera/dp/B074BWGRKH