Just so happens that an Annodizer is easy to make. But If you want to buy one Check out Uncle Al's at Riverside machine If you look farther down the page there are instructions on how to use them.
If you want a quality sturdy heavy built stand For your portable bandsaw Google swag off-road. Their stand is the best out there and it fits both Milwaukee and dewalt. I own one and the only problem I have with it is I don't have 2 of them.
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Most charge a fee. Some sell T-shirts with the fee so at least you can walk away with something
I'd say demos and activities. Show some kids how to forge or a cutting competition