In my apartment complex there are dumpsters just for cardboard, and then one just for plastic waste recycling. We take from there fairly often, especially if someone is moving in or getting a new couch or something, there will be great stuff available.
I ask on a post it note system at work and people give me peanuts and cardboard constantly. Since I ship auto parts im always trying to get free packing materials to help my buddy the Earth and my other buddy my wallet.
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