My $700 Leveno Flex 5 I bought end of 2017 came with a Samsung 240GB SSD. Don't recall if it was NVMe, but it was M.2 form factor. Added a 750GB Crucial MX300 750GB to it.until laptop manufactures start using them instead of sata m.2 i don't see pcie ssd's surpassing sata SSD's in 2019.
these days most come with a 128GB SSD and 1TB mechanical drive. that being said though the SSD's a piece of junk and doesn't really matter.
With current retail pricing I hope $700 laptops start coming with 1TB SSDs out of the box.