I have used both of these businesses and were very pleased with their work, not for roll bars but for other things. I know that they are located on the Gold Coast however a quick call will answer if they can bend to the size you are after without set up costs. Both also should be able to supply and polish tube as well.
V=http://www.protube.net.au/
Pipe Bending Services,Handrails & Balustrades Services, Metal Rolling Brisbane, Gold Coast - Tube Bend