Lightly used ThinkPad P50 i7-6700HQ 2.6GHz, 8GB DDR4-2400,  Quadro M1000M, 512GB NVMe, Windows 10 Pro properly activated. A great machine if you want multiple drives -- it supports two NVMe drives and one 2.5" drive!

Free shipping to most of the USA, but because of the higher cost not shipping to Alaska and Hawaii or anywhere else.

Intel describes the product in detail at:
https://www.lenovo.com/lk/en/laptops/thinkpad/thinkpad-p/ThinkPad-P50/p/22TP2WPWP50
This one has the i7-6700HQ CPU chip at 2.6 GHz, 4 cores, 8 threads
Not a touchscreen model, but is a very nice-looking 15.6" 1920x1080 monitor and the trackpad with two sets of mouse buttons works great.
Lightly used -- I got it for my wife to use but she thinks it is too heavy for her. I just weighed the laptop all by itself at 5 pounds 15.3 ounces. Including the battery, which will run for four hours if you don't do much, at least according to picture #5. The heavier you use it, the lower the battery life, of course.
Machine Type 20EQS25V00 with BIOS updated to 20oct2021
I plan to wipe the drive with 0s and then reload Windows 10 Pro which will automatically activate. I can place the Lenovo drivers I have downloaded on a small second partition, in case you ever want to reinstall Windows. Or perhaps you prefer to do all the installation yourself -- up to you! I am happy to install the recommended drivers for you if you want. The Nvidia driver takes a manual installation under Windows 10, for example (even though when I tried Tiny Windows 11 it automatically installed the Nvidia driver!) I could be talked into wiping a 2.5" drive also and leaving that in the system if that would be beneficial to you -- drive specs upon request.

Summary of pictures: #1) keyboard and 1920x1080 screen with no screen defects. (If you look closely you may see that Microsoft Office 2003 and 2019 are both installed, which is a difficult feat. I prefer 2003 for its excellent outlining capabilities for writers. Just pointing this out since neither version of Office is included; this is just the situation before I wipe and reinstall the operating system.)

#2) Standard 18.2 oz. 8.5 amps 170 watt power supply; can add the 14.8 oz. 6.75 amps 135 watts power supply for travel upon request. Won't charge as fast, of course -- the reference guide says to use 170 watts:
https://psref.lenovo.com/syspool/Sys/PDF/ThinkPad/ThinkPad_P50/ThinkPad_P50_Spec.PDF

#3) Windows Performance tests finds no hardware errors. 

#4) WiFi list shows both 5 GHz and 2.4 GHz capability (L5 and L2 SSIDs)

#5) Speccy shows running cool. Also shows two drives, but the second drive will be removed and leave you with the special connector to add your own 2.5" drive.

#6) Closeup of the Toshiba KXG50ZNV512G NVMe drive 512 GB mounted in its special holder. This drive is described at:
https://www.memory4less.com/toshiba-xg5-512gb-pci-express-3-0-x4-ssd-kxg50znv512g#:~:text=KXG50ZNV512G%20Toshiba%20XG5%20Series%20512GB%20TLC%20PCI%20Express,M.2%202280%20Internal%20Solid%20State%20Drive%20%28SSD%29%20Refurbished
as a

"KXG50ZNV512G Toshiba XG5 Series 512GB TLC PCI Express 3.0 x4 NVMe M.2 2280"

My only concern about this drive is that I haven't found a way to make it report SMART parameters, which means I can't tell you how many terabytes it has read and written,, the power-on hours, etc.

#7 through #9) Keyboard views of left side, right side, and from the top. Keyboard looks and feels great!

#10 through #13) front edge, back edge, left edge and right edge

#14) top cover showing minor wear

#15 through #16) with back panel removed showing room for two NVMe drives and one 2.5" drive. The 2.5" drive is not included.

#17 through #18) Significant scratch on the back, but #18 shows the scratch does not go through

#19 through #20) Overviews of back panel; if you look carefully you will see a second serious scratch which is triangular in shape

#21) top of the UEFI BIOS screen above the MAC address, which is best kept a secret

#22) SK Hynix 4GB stick which is faster than the two 2 GB sticks mounted under the keyboard. The exact configuration is 
a total of three Single Rank DDR4 sticks totaling 8GB:
Slot #1 SK Hynix 2GB DDR4-2401 1200 MHz HMA42556AFR6N_UH Week/Year 51/16
Slot #2 SK Micron 4GB DDR4-3200 1600MHz 4ATF51264HZ-3G2J1 Single Rank Week/Year 26/20 1RX16
Slot #3 SK Hynix 2GB DDR4-2401 1200 MHz HMA42556AFR6N_UH Single Rank Week/Year 46/17
Slot #4 currently empty
Slots #2 and #4 easily accessible under back panel; other two slots are under the keyboard

Thanks for reading the whole spiel!