As fall approaches a lot of wild edibles will be going to seed. People are willing to buy these seeds on ebay.

Another possibility would be flint/steel fire starter kits with the steel cut from an old, high quality file. These files are easy to find at flea markets. You don't need to do any forging, just carefully cut them into 2"-3" pieces and round off the edges. A Dremel tool works well.

Pet sitter.

Dog-poop yard cleaner.

Flower bed weeder and mulch layer-downer.

In general, find a dirty, yucky chore that people don't like doing and do it for a price they are willing to pay.

-Blast