I'm not sure about the prices, but because there are not very many they are usually all booked up by DVC members. If there are any available for public use, you can look them up at around 6 months before the date you want to go. You best bet would be to go to the DVC rental board and see if someone has enough points for you to rent, the member may be able to get the villa for you and it won't cost as much as booking through CRO.