i've been trying to find out the same thing. Currently i've been using fiverr. Which is a website that you post the things you'll do for 5$ and when someone buys it you do it and send it to them. You actually only make 4$ though. So thats alright it's slow going waiting for the orders sometimes though.
Baby sitting is a good one. and possibly shovelling snow. (think i might try the snow one today. )
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