You can also go to the Walt Disney World website and look it up under reservations and tickets if you want to get an idea of costs before you call. If you have an AP you may be able to get a better rate for certain times of the year also when you call the CRO number.
Oh yes - some people go to the rent trade board and rent a reservation directly from a DVC member. You would want to read the info at the top of the thread about renting before you make a decision to do this however..