Around here (Nor Cal), tcdesignfab.com said $850 for basic 4 point rollbar (rear 1/2 only). This is a MIG welded bar made from DOM steel. They will fit it in the car.
I like this better as they attach the bar to the frame rails and not the floor sheet metal. Or at the very least the floor sheet metal is strengthened by means of welding metal base plates connecting the rail and floor. Sheet metal isn't as strong as the car's frame rails. I don't quite like the fit of the autopower cage either. So I might end up going for a basic 6-point weld in cage. Estimated price, $1500.
If Roxanne is going to be a commuter/track car, then maybe a good rollbar is all you need until the 3.7 is done. I saw the autopower rollbar on Alfaracer75's car and it was ok, not too great. But the price is reasonable. However when I take into account shipping and other options (removable crossbar etc) the price jumps close to $600. And I still have to fit it myself.
Fortis621,
Your cage is very elaborate. I'm pretty sure it costs more than the car
.