Prices are quite okay. The most important German bookseller on Classics. Habelt sends catalogues in printed form or as e-mail and has them on his site. Prices are normally quite okay. . Catalogues by e-mail or on their homepage.
Paperbacks are often extremly cheap.
You can check their stock on their homepage or at Bibliofind. Prices are appropriate. Catalogues are sent by post, but you can check their stock at ABEBooks. Particularly older French books on archaeology can be obtained from Picard. There are often excellent bargains.