Hi there, It is probably cheaper to buy a new set of wheels, as the cost of buying the hubs and then getting the wheels built up will probably cost more, unless you are a wheel builder then I am talking a load of old toot. What size wheels would you be looking for? Have a look at
Evans to see what takes your fancy and your price range. I have several different wheel sets, Campag Shirocco on one bike and Shimano hubs with Mavic open pro rims on another.
http://www.evanscycles.com/categories/bike-components-bike-parts/wheels-rims-hubs