Met up w/ this guy and bought a 55 gallon bag of packing peanuts for $15. This thing is like 5 feet tall. Worked great when i shipped out my air suspension.

He also sells shredded cardboard for packaging, and he's got a few hundred small boxes too for 10 cents each.

http://dallas.craigslist.org/ndf/bfs/1274383535.html