Prices will vary according to the size of the villa ( studio, 1br, 2br or grand ) and time of year and also resort. You can get an idea on disney.com by asking for room only rates on dates that you want to travel.
Keep in mind too that these rates can sometimes be discounted if you are an AP holder or through booking with AAA, among other things.
DVC members are sometimes eligible for 25% discount on cash reservation at dvc resorts ( applies to dvc rooms only so regular hotel rooms at WL, BC, BW, AK would not be eligible ) BUT this discount is not always available & may not apply to all dvc resorts or to all villa types for dates you are interested in.