For truly great bookstores, one needs to travel. Here are two superb ones; you can spend many happy hours browsing in either of them, should you be in Chicago or Iowa City.
The Seminary Coop Bookstore (member owned, with 10% member discounts), in Chicago's Hyde Park neighborhood, 5751 S. Woodlawn Avenue, 773-752-4381,; the Coop has an enormous selection of academic books, perhaps the best in the world outside of Blackwell's in Oxford.
Prairie Lights Bookstore, 15 S. Dubuque St., Iowa City, 800-295-BOOK, Both of these stores will take orders over the phone or on their web sites; the web sites have much other useful information.

Consider supporting these great bookstores instead of  There is also Barnes & Noble in Peoria.