The Carreras are pretty common wheels. And someone's wrecking a Boxster every week.
Try posting a WTB thread on Craigslist in your area. Maybe something will come up.
You used to be able to get the Italian replicas for about $700 a set. They weren't 20lbs. though but the fit didn't require spacers in the rear.
But the Forgestar F14's in 18" are my favorite non-Porsche wheel. Tough to find in 18" though.
