Mansfield Taxi's?

Bu$hleague

I wasn't planning on going to either of the Mansfield shows because: a) I'm broke and b) although it's the closest show to me, it's still a few hours away.

but after seeing their set at Bonnaroo, I just had to finagle myself a ticket (i'm going to the show on the 30th).... but anyways, what I'm wondering is, does anyone know if taxi's are expensive there? To get there, I plan on taking the train, a taxi from the train station to the show, and a taxi back to my girlfriends house in Quincy for the night.
Anyone know how much should I expect to spend going from Mansfield to Quincy via taxi? And do I have to call them ahead of time, or are there taxis waiting for people outside the venue?