Operating systems and drivers will allow rotation of most monitors and it mainly comes down to a matter of mounting hardware if autorotation isn't a big deal. Monoprice has a stand for about $20.
There is an non-obvious caveat to using vertical monitors on Windows though - ClearType font rendering doesn't support vertical subpixel arrangements, so you're stuck with naive anti-aliasing.
Color subpixel font hinting is on its way out. Windows 8 and 10 stopped using it for UWP (including the start menu / start screen); DirectWrite doesn't use it (font rendering in Edge and Firefox); Office 2013 doesn't use it.
Certainly screen rotation (with windows tablets and phones) would involve a lot of inefficient re-rendering. But i think the official reason was that since the subpixel colouring effect depends on the background colour, it's hard to animate transitions efficiently.
On a high-DPI screen, you'd be hard-pressed to notice the difference compared to greyscale hinting. Colour subpixels were a great hack, but high-DPI is the proper solution to this issue.
http://www.monoprice.com/product?c_id=108&cp_id=10828&cs_id=...
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