Pretty much what I use my macbook air for - £900 back in 2013, battery still lasts several hours. The electrical tape over the webcam reduces the 'expensive looking' part.

For real work on the road I use my t410s and ubuntu (although the hinge has now gone, which is a right pain), but most of the time I do real work I'm at home and use my z440 HP workstation (also with ubuntu)