Probably not the place to ask, but what do you need them for? I think there's still places that sell books by the yard. You can also try estate/yard sales, and just offer ten bucks to haul all of their books away.
That's how I buy a lot of my books currently (estate sales, library clearance, etc) but regarding the sliced pages: I have a very large personal library that can't be damaged or marked up for a variety of reasons. It just so happens that I have three uses for well-sliced pages of (preferably) interesting books: for sculpture, for rebinding practice (what better source for testing out different glue mixtures or techniques), and lastly to spiral bind a few into markable workbooks (I used to do this with tattered textbooks and then give them away). I can't really go into it from my phone, but suffice to say I have a soft spot for recycling old books and see it as a possible opportunity to find a non-standard selection.
Edit: Also, if someone is just throwing them out that saves me money and therefor time trying to decide what to take.
Many second hand book shops have too much stock, to the extent that it causes them storage problems. If you ask them they will give you lots of (shitty) books for a low price.
