This charming, small shop at the heart of town has a tremendous collection of historic Japanese prints and the owner speaks excellent English. Prices range from €45 to €2500; the shop also sells cards.
On Sundays and Mondays and outside of these business hours on other days, you can ask the other shop at L'Atelier St Romain (No 28 rue St-Romain) to let you in for a look around.