We have three of these available if anyone would like one. Working but have some minor cosmetic damage (chips etc).
They sit on top of a normal desk and make it into a standing desk when you need it - moves up and down on springs.
89cm wide, 57cm deep (the keyboard tray at the front sticks out another 5cm forwards of that). When in sitting mode it's 15cm high and extends to a maximum of about 50 cm
Ergotron desktop sit-stand workstation (Trowbridge BA14)
This offer has been gifted to someone and is no longer available.