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get a invite to build a jib 101 cult they is very useful info, also if you use (I hate to say it) the search bar there are a couple of dozen threads on this.
you an get all sorts of plastics here. but the best stuff is HDPE here's a link you can buy some at not too bad prices. http://www.usplastic.com/catalog/product.asp?catalog%5Fname=USPlastic&category%5Fname=72&product%5Fid=10369