Yes, I had a 1967 Bibliothèque de la Pléiade edition of Paul Claudel's poetry in my hands, with only the slipcase, yellowed with age, bearing any marks. I glanced again at the price. Only $4. While more expensive than most foreign language books I buy there (most French and Spanish fiction paperbacks are 10¢ or 15¢ in price), I would have to say that finding a very good to excellent condition Pléiade edition for 1/16 of its list price to be quite a bargain.
Any of you have similar discoveries of expensive books being sold dirt cheap (and in good condition) in a used bookstore?