Mimi,

Yup, that's why you repack your hubs periodically or at the first sign of non-smoothness - so you don't have to replace parts. The cones go first, then they will wear pits into the bearings, then the bearing will wear pits into the cup surface of the hub body. If the hub body gets damaged, you have to replace the whole hub.

You might be able to mail order some cones if you can't find them locally. This place looscrews.com has a few Campy cones. I've also gotten brand new Campy cones on eBay.