Retail Arbitrage. Buy new items at a discount and sell for near market value. You can do this by shopping at Marshalls, Ross and Burlington. Myself, I like Nike Outlet stores. Nike shoes are high in demand and you can flip pretty easily. Limiting your inventory can make you focus on higher Average Selling Price.
RE: Poppin Tags, How I Made $1000.00+ on Ebay Last Month in my Spare Time