We bought around 400 cubic feet of packing peanutes while in university. Filled a dorm room to commemorate, if memory serves, a birthday. Or something. We called around to the normal shipping places (UPS, etc.) and it was going to cost a couple hundred for the materials (way too much for starving undergrads). Yellow pages helped us find a shipping supply store, 3 trips and $45 later, voila!
Worst part was the guy riding in the back seat with some of the peanuts kinda sorta passed out from the noxious fumes eminating from the styrofoam. Learned to roll down the windows on the next two trips...
Cleanup was a beast too now that I think about it.