IMSLP will be back online after the 1st of July, and before it went down it had some 15,000 scores which were available legally for free.
So, if you think you can wait, definitely go and check that website
It's definitely worth it, I give you my promise.
Other than that, you can try mutopia-project.org, the werner-icking archive, and the choral-something archive. I can't remember the exact links, but if you google them they should come up (don't be too much of a lazy-ass
)