If it hasn't already been mentioned, I would look into reselling items on Ebay. You can easily cross reference items on craigslist with items on Ebay and earn the difference. All it take is snapping a few photos and copying the website description. I do it all the time while sitting on the couch relaxing at night. It's very easy to do with just a smartphone. You can also go to yard sales and pick up items for next to nothing.

I do it myself for hobby money. Start with items you already know a good deal about and then branch out. There is a ton of money generating power right there in the palm of your hand if you'll just embrace it.

"The kill is the satisfying, indeed essential, conclusion to a successful hunt. But, I take no pleasure in the act itself. One does not hunt in order to kill, but kills in order to have hunted. - Finn Aagard