pianomart.com for second hand pianos, which give you an idea of prices and what's out there.
Second, just as with cars, there are loads of technicians that have no idea what they are doing. Judge by the state of the other pianos they service or offer for sale. Try several, you will be able to tell right away which ones are the good ones.
Brian, wouldn't you agree that for the most part the pianos in www.pianomart.com are significantly overpriced? That's my impression. Exceptions, of course.
I would be eternally grateful for any help.