Stopped in here while visiting my friend who lives in Madison... We had just eaten dinner next door when I spotted MadCity and went in.
Great selection of new and used records... and the prices on used stuff were very good! I live in Atlanta and go record hunting all the time, so I know fair prices on the stuff you'd actually want. Snagged a copy of Bowie's 'Alladin Sane' for a good price and could've easily stayed in the store for longer, but we were on a tight schedule.
Definitely stop in here on your trip to Madison!