$1500 - $2000 for the tubes & frame sounds about right to me. If the tubes are over 10 years then they are out of warranty. Not that it's a huge deal if they are in good shape. Maravia tubes are pretty bomber.
"We are all visitors to this time, this place. We are just passing through. Our purpose here is to observe, to learn, to grow, to love....and then we return home."
Australian Aboriginal Proverb