Chad, your best bet is to look at online classifeds for your particular area. There can be pretty wild swings in values, depending on region. This will be based on dealer availability, dealer quality, and sometimes on just plain old producer loyalty.
I also like to use Tractorhouse.com and Ironpeddler.com as general guides. You can limit your searches to your general area to view mainly dealer inventories. This will provide you with DEALER prices. However, I would also check local classified ads as suggested to compare to.