Focusing on the format and "reader status" of the book can save you hundreds of dollars over time.

: On platforms like eBay, search for the term "reader copy" or "low grade" . These are books in poor to fair condition (creases, spine rolls, or markings) that are still 100% readable but have little value to serious collectors, making them very cheap.

For the lowest prices, prioritize retailers that specialize in "dead stock" (overstock) or second-hand inventory. :

: Open to the centerfold to see if the staples are original or rusted. Rusted staples can migrate and ruin the paper.