I don't think there are going to be any weekend available to rent unless someone has been holding on to the reservation. Even the full weeks and the M-F reservations at this point aren't available for owners to make new bookings. The BG owner would have already have reserved the time and not rented it out yet.
I had three to rent out this year and while none were huge money makers for me, none of them would have fallen into the bargain last minute rental category.