I own one of these, just wanted to add some info. The description says "Holds screens up to 24 in." but I am using it with a 27" monitor, as it will support up to 17lbs. I wrote a review here: http://www.newegg.com/Product/SingleProductReview.aspx?ReviewID=4033602
It works best with narrow HDMI and power cables as there is not a huge amount of room for cable management, and you won't be able to fit many other cables (USB etc.) in there.
It's a great stand, so I'm not sure why they are not readily available.