What would be a reasonable price to pay for a UW Badgers ticket?

I was unable to buy season tickets for the 2011 season for the Badgers and now am looking for them on craigslist. Some people have individual games and they want to know how much I am willing to pay for them. I don't want to pay too much, but don't want to say a ridiculously low price. Any suggestions on how much I should pay per ticket?