These links may help

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$300 for an engineered truss that spans 32' sounds pretty darn good to me. I saved these links when I was looking for plans for a pole barn structure for my tractors,woodshop,etc.

http://www.shelter-kit.com/home.html
http://www.webworkz.com/~noff/barns.html
http://www.abetterplan.com/

Use your favorite search engine(s) to search for pole barn plans. Pole construction is a viable alternative in many cases.

Hope this helps

Tim in VA