Almost all the rentals for Sundance have been booked already, but I do know of a few management companies who still have one or two locations available. The main limitations are number of people staying and how close to Main Street you need to be. Time is of the essence if you want to find anything this late in the game.
You are welcome to contact me at firstname.lastname@example.org if you'd like to know what you can still get.
Happy New Year.