I don't think a lot of people get the gear model on the B2320 or the B7510 when they still made them. So. You may not get a whole lot of responses. I would look at the prices reported here on the same setup with hydro transmission and subtract about $1000 or so.
Best of luck with your search. They are very good tractors.
That quote doesn't sound right to me either. Double check, or check with another dealer.