It's becoming increasing difficult to find a good used bookstore. The only secondhand shops staying alive seem to be next to fast-food joints in minimalls and trade in cheap romance novels. So you have to try extra-hard to find an old-fashioned store with curious out-of-print volumes lining tall shelves, spilling onto the floor, and hiding in nooks and crannies. In other words, the kind of place you'd never find in the clean confines of cyberspace. To reach Dunbar Old Books, you need to navigate blind streets that twist into a quiet industrial zone with no sidewalks. Proprietor Mary Ann likes to stay out of the way — she does most of her sales online and doesn't keep a strict schedule. So she'll probably be upset to learn her store has been named, hands down, the best used bookstore in town. Just make sure you call first. And please don't say you heard about it here. Hours are 11 a.m. to 5:30 p.m. Monday through Friday and noon to 5 p.m. Saturday.