My wife sells stuff that she finds on clearance (80-99% off) for profit on both Amazon and ebay. Nothing huge and not something she spends a lot of time on, but when she sees something really cheap, she'll clear out the shelf at the store (or stock online) and list it for sale. About $3,000-$5,000 a year profit which she uses to buy more stuff to sell - anything extra, we use as our vacation/fun fund. If you choose to do this, set it up officially with a business license, sales tax certificate, etc.