https://www.cnet.com/news/lg-v40-thinq-preorders-are-open-now-begins-to-ship-oct-16/

Preordered phones will ship out to customers starting Oct. 16 (with AT&T) and continue throughout the week.

Some of these companies have promotions when you preorder the phone, so it's worth checking out a few options before you buy. Right now you can get a DJI Gimbal and a 256GB microSD card if you preorder through most of the sites above. There are also some carrier specific promotions, like buy one get one free through AT&T or get $200 off through Verizon (terms apply for both).