For our team of 10 it is usually around $140. BUT we don't rent big vans like most teams do. We use some combo of our own minivans, SUVs, trucks. I actually like the truck option (assuming no rain) b/c it's easiest to get to your stuff. Just throw it in the bed.
We'll chip in some money for gas, and take turns driving. Also, the $140 doesn't include whatever food and drinks we stock up on.
Lastly, our team is a mix of Dallas and Houston area folks. The Dallas guys have the expense of a motel on friday night. Houston guys just drive to Gonzalez Saturday morning.