this article on making a desk for $22.
The notion is that you're just putting a small desk on top of your regular desk. So that cheap little $7 Ikea desk is just fine.
There are kinks to work out. With the monitor so high I end up looking into one of the light sconces in the office. This is less that good. And speaking of light, I managed to cover up the sconce over my desk (while simultaneously looking into the light -- good trick) so we need more light in the office.
And the audio monitoring situation is a mess right now. I have to get that worked out. Mixing while standing -- it's going to be interesting.