Next fall I will start commuting into a university campus with a very high property crime rate. I picked up an old 10-speed today (calling it a "beater" feels wrong, it's a nice old Raleigh) so I won't need to worry about leaving my Surly locked up on campus all day.

I have a Brooks Imperial on the Surly. It works well for me, but I'm not dropping $150 on a saddle that I plan to leave in the middle of campus all day, every day. (No, removing the seatpost and carrying it around is not an option. I have enough crap to schlep around all day, thanks.)

The commute is 4 miles each way. No long rides planned for this bike. I absolutely need a saddle with a cut out that is at least 155 mm wide. Other than that, it would be nice to find something that doesn't look too awkward on a vintage road bike. My budget is $50 or less. Suggestions?