We are fortunate in Amsterdam to have a WONDERFUL sheet music store next to the Concertgebouw: Broekmans & Van Poppel. They stock just about everything and order what they have run out of or don't stock very quickly. If you are in town for a concert, it should be a must-visit stop on your list. Make sure you tell them you are a teacher to get your discount. They also have a great antiquary department upstairs that changes often and often contains rare, out-of-print editions, as they tend to buy the entire collections of used music from the estates of dead professional and amateur pianists without interested heirs (of which there are, unfortunately, more and more every month it seems).
Great service, nice place to hang out browsing,...and realistically, perhaps they too will be out of business in another 25 years....who knows?...they also have a website but it is not their core competency, to put it politely:
http://www.broekmans.com/en/default.cfmOnline alternatives:
www.musicstore.co.ukwww.amazon.co.ukwww.imslp.org for a great selection of public domain free scores
