Sell Lego Parts
"It's not me but a friend of mine. Anyway, he's really into Legos. What he does is buy Lego kits on clearance and hit the bins in Lego stores, Goodwill, etc. Then he breaks the kits down and sells them on eBay. He makes about $800 bucks a month after taking out the expenses of purchasing the kits and listing fees.
. . . Find something you're into and knowledgeable about, like golf clubs or Legos or whatever. Then collect items and turn them over on eBay."