Glad I could help. You might look into some of the smaller areas, Durango, Crested Butte if you are driving, and maybe New Mexico. They are likely to be less crowded. I do not know those areas at all so cannot help with lodging suggestions. It has been my experience that Breck is more crowded than Keystone though both will be very busy at that time. Another small place to look at is Ski Cooper, it is a quiet little area but with enough to keep beginners interested but no real night life in Leadville.
If you are set on Summit County you can wait and see if anyone has space last min that they would rent to you for less. The towns of Dillon, Frisco and Silverthorne will be less than at the resorts proper.
The only other site that I know of is http://www.skigolfvacations.com
that sometimes has good prices.