I am using valuate.com at the moment... They are using estibot v.2
The thing is still in beta, and they keep tweaking it.
For instance, Asiaminor is now valued at $3800. And I've put a philosophical reference to be valued: Boethius and it comes out at $5300...
For Boethius, it is beyond me.
For Asia Minor: I am targeting specialist tour operator.