If we can't find a good place to rent, maybe we could all just book at the same hotel?
This one seems to have a great deal: from now til the end of the season, rooms are just $75:
http://www.hobknobinn.com/packages/37.html
Standard rooms appear to have two double beds. I don't know if it would be slightly more on weekends, but something to consider. This also comes with breakfast, which is great.