Ross, what symptoms are you having?
Common ones are sluggish turning the engine usually due to bad earth and/or battery.
Can you hear a cluck to indicate the solenoid is working? Does tapping the solenoid body with a piece of wood release a sticking solenoid?
DIY servicing is reasonably straight forward to fit new brushes and clean the commutator.
I am sure there are auto electrical businesses you could go to for checks/refurb rather than import. That would be a last resort if the starter is knackered beyond repair.
