They start at about £25.00 depending on the model of wheel. Or look for a damaged wheel on ebay and swop the hubs, you could probably sell the campag one to recoup your money.
http://www.chainreactioncycles.com/...GYcid2wPVSFWxOwNKp_yEaAn_k8P8HAQ&gclsrc=aw.ds