Just wondering if some can where I can get the stainless steel inverted ushape pipe that you see on boats where instruments etc are mounted. Can they be purchased or made. Does anyone have any idea of expected cost. The pic is for an example only and would be larger than my requirements as my boat is 27' wheel helmed.

The tube is not too expensive. Bending it can be done in a lot of boat shops (where they repair fishing tinnies and the rails).
One retailer of tubing, angles and bends: www.geordi.com.au/Products13D.htm