Opening an old book, like sampling an unfamiliar, spicy cuisine, broadens your mind, opens your eyes, and sometimes makes you sneeze. Brush the dust off of literary treasures with today’s Groupon: for $10, you get $20 worth of used books at Browsers’ Bookstore’s Corvallis and Albany locations.

Browsers’ Bookstore tightly packs its shelves with more than 34,000 used books ranging from recent hardbacks to vintage tomes several hundred years old. Compare the movie to the book with Ian McEwan’s Atonement ($8) or delve into the unfilmable Swann’s Way by Marcel Proust ($4) before time-traveling to the vast sci-fi section to absorb Isaac Asimov’s The Bicentennial Man and Other Stories ($7). Bibliophiles at the Albany location peruse possible purchases by the eco-friendly light of a recently installed 10,000-kilowatt solar-panel system. Alternatively, visitors can meander at random through the store’s labyrinth of precracked spines, rescuing literary treasures from dust, decay, and book-burning firefighters escaped from a nearby copy of Fahrenheit 451.