Shuttle [click here] make one for their Shuttle XPCs however I am unsure as to whether it works with other machines. Might be worth emailing them to find out. I am sure there are other manufacturers of these out there though!
HP Envy x2 review: Hands-on
How Sketch and InVision have revolutionised our design workflow
The best tech gifts for Christmas 2017
Les meilleurs jeux de société (2017)