It's worth noting that the Lenovo IdeaPad Yoga 2 Pro and Samsung ATIV Book 9 Plus are not true 3200x1800 though. The Samsung PLS panels in these laptops make use of the
RGBW-Pentile sub-pixel arrangement which, to be frank, is more-or-less of a tool for resolution advertising scam than anything else. Instead of each pixel consisting of all three of the expected independently-variable red, green, and blue stripes, each purported "pixel" has a pair of either red & green, or blue & white stripes. This results in 1600x900 being the lowest "true resolution" in which each square grid cell is actually capable of independently representing the full spectrum.
To add to the running list though, the Dell XPS 15 is $1830 with a 15.6" 3200x1800 display
http/www.abt.com/product/75953/DELL-XPS156842SLV.html
http
/www.bhphotovideo.com/c/search?Ntt=xps+15&N=0&InitialSearch=yes&sts=ma&Top+Nav-Search=