update MVS price guide.

With kit and loose versions, Its a big job I know but would be very helpful. Im sure lots of people would help to find an average for the harder to value carts.

It would be cool if instead of getting one person as an anylist you had like 10 to 15 people who could enter their prices and it would come up with an average of that (droping the lowest and highest)

OR an automated system where whenever someone sold or bought one they could enter what they paid and average it from that. There would have to be some way to keep people from screwing with it, though.