I don't know what HPB is, but it's got to be good if it has Joanna Newsome in it. :)
Half-Price Books. They carry used books, movies, music, and games. A lot of times you can find sort of rare stuff there for pretty nice prices. I guess it's actually a pretty big company. Whatever there's at least three of them in C-Bus* and I make a point of hitting at least one up every week,
* Or possibly one. Basically the ones I go to are in Upper Arlington, Dublin, and Clintonville. The ones in Upper Arlington and Dublin are sort of on the border between UA/Dublin and Columbus-proper so I'm not entirely sure where they are. Also it's debatable whether Upper Arlington is an autonomous city or not. Meanwhile, Clintonville doesn't technically exist.