Is there a desktop add-on that would allow a normal desk to become a stand up desk? It has to be purchasable and quick to assemble (no cutting or drilling).
Basically we have a bunch of desks that cannot be replaced (built into the cubicle walls) so we need "vertical extensions" if you will that would allow a user to convert to standing.
Depending on the existing height of the desk, I suspect a variety of laptop stands would work for raising a laptop + mouse to standing height, though you may need an additional platform per desk for the mouse.
Desktop machines with a separate monitor and keyboard make things harder, but honestly I would just use a laptop stand for the keyboard + mouse, and go low-tech for the monitor: buy a bunch of cheap, thick books, stack 'em together, and set the monitor on top. Apply duct tape as needed for stability.
(Your question is definitely relevant to startups if the answer involves duct tape.)