We don't have a cutter in the house. I thought I had a good setup with a larger, local offset shop to do our cutting where they typically did it for free and a poster or a small charge but they just nailed me with $30 for cutting a stack of about 60 posters. It takes them 10 minutes or less. Unreasonable? Seems like it to me.
Guess we need to buy a cutter but what would you charge if someone asked you for this?