Preferred Vacation Rentals has the largest number of vacation rentals in the Lakes Region. I'm mostly certain that they will have something that would definitely suit your needs. I also heard that they are even accepting reservations for next summer.
You can book online at
www.preferredrentals.com or call them - they also have a staff that is there 7 days a week from 9:00 to 4:30.
And no, I am not an employee!
Good luck!