You are looking for
studio furniture:
http://www.zzounds.com/cat--Studio-Workstations--2803
I built my own with stuff from Home Depot/Lowes. Mainly a couple of sheets of 3/4" and 1/2" birch plywood and some 3/4" black pipe (various lengths) and flanges. It took me half-a-day and I was able to make it to MY specifications. I'm not a DJ but I do use an 88-key keyboard so it's basically the same thing.