How much is a 1965 Buick special worth?

Just saw an add in the local buy sell trade, some one was selling a 65 Buick special Convertible. Still waiting for pics from the seller, but wondering how much a moderately good shape Buick Special would be worth.|||about 50 bucks|||It depends on the options and the conditions of the car, but according to the nada guide it should cost between $6,675 to $ 23k