Free boxes for moving?

Any idea where I can acquire cardboard boxes for moving? I am morally opposed to the idea of paying for cardboard boxes. I've moved a lot, and usually business are happy to give them away if you ask nicely, but for some reason every business here is very stingy and won't give me any. I've gone to half a dozen liquor stores this week that had tons of boxes stacked up behind the counter but wouldn't share :/