I've got a 50mm Corima carbon front (very light) and 90mm HED Stinger rear, although they are both tubulars. I purchased on eBay for around $700 less than a year ago, but would sell for $500 + shipping with the mounted Continental Sprinter tubulars. They have a little wear on the carbon braking surfaces, but still have a lot of life in them. I've used them for several sprints and an oly this year, but no longer need them.
I've got a pair of HED Jet's, 700c, Shimano, tubular. They're about 6 years old but in good shape, still rolls smooth and straight. Cheap way to get race wheels, $300.