American Science and Surplus carries a miniature catapult that also includes plans on sale at their site. They sell many things related to science and engineering.
Online at the website.
buy one
You can buy one on ebay or craigslist
the store
Pondland
toys R us
There are many places that you can buy a hand truck online. Two places that you could buy one online at Sears. Or even from Walmart online.
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1. Buy wood 2. Buy string 3. Buy nails 4. Buy a hammer 5. Buy glue 6. Put it together 7. Buy a smoothie Optional quality assurance step: 8. Place smoothie in completed catapult and test it.
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