Originally Posted by PacificNWrib
They are kind of spendy,
There's an understatement. I remember looking at them when I was A-frame and tank rack shopping.
Zip; you should be able to find a local fabricator who can bend up stainless or aluminum tubing and weld it up to your design. Draw it up, and start calling local metal shops (if you're going aluminum, try local muffler shops as well.) The critical parts are the mounting base dimensions, so you may want to arrange an in-boat fitting prior to completion. The rest is relatively simple (well, except for the bending and welding part...