Then they shouldn't have any trouble finding one. I'm assuming they own timeshare and are interested in exchanging in? I.I. Getaways, if they belong to I.I., are always a possibility as well. Availability in Branson, especially before school lets out, isn't usually a hard thing to come by.
If they're looking to rent and are not timeshare owners or members of I.I. or RCI they might want to check the Classifieds as advertising for sale or rentals on the discussion forums is prohibited.