piano scores are harder to find this days
other than composer who died like mozart, chopin,beethoven, their scores are not COPYRIGHTED so anybody can post them in thieir web.

the usual scores u find are arrange by ametuer musicians where the good scores are bought in books.
so giving u easy scores, isnt that a great way to improvise?

I prefer easy scores and improvise myself, it is better.

Anyway, the best place for score? torrent. nuff said