Mike, If you're looking for new, try http://www.motorsportseats.com/corbeau/index.html More info is also listed in the shops section. I'm looking for a harness also (no bar) and after talking to some guys last weekend, apparently Jim can do Corbeau harnesses for around $75... half the price of a Schroth harness. Haven't talked to him yet, but Group Buy maybe?
I have the front half of a Corbeau 4-point harness that works without a harness bar. I think Zak has the back half. If someone cares to hunt down the back half, they can come get the front too, because I won't be using it.