You can get most of it for free... the only thing you probably need to buy, if the weather requires them, are heat packs which you can get at most herp or aquatic supply places. You may also need to purchase snake bags (if you don't have any, you can buy pillowcases from walmart). Cardboard boxes can be found for free at many stores, deli cups can be found at the grocery store, styros can be found at supermarkets/fishmarkets/butchers, newspaper can be taken from your recycling box or neighbours'
A few links that may be of interest...
http://www.thebeanfarm.com
http://www.reptilesonline.com/packingmaterial.html
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