Where can I get an add-on shelf for audio gear?

I have a flat surface that has one component on it. I'd like to put another under it but want to avoid stacking. So essentially I'm looking for a small structure that looks like the letter "H" so that I can place one component under another. Does anyone know where I can obtain one premade or have one built resonably?
Thanks Timrhu. That might work for my application and the price is certainly right.

Any other ideas?
Something like that would be so simple to build, even with minimal skills and equipment. If you just want to buy something go to Home Depot, Lowes, etc. If you want something custom made, search the yellow pages in your area for cabinet makers.