One site, Tingo, seems to have all my top choices except they are sold out for the dates I need.

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Book a hotel room through Tingo.com and the new site will rebook it, free of charge, if the hotel lowers its rate.

WSJ: Summer Travel��Where the Deals Are ��and Aren't

Which brings us back to de Boinod's title: tingo is an invaluable word from the Pascuense language of Easter Island meaning "to borrow objects from a friend's house, one by one, until there's nothing left".

BBC: NEWS | UK | Magazine | Tingo, nakkele and other wonders