According to an AC Nielsen study conducted in early 2005, as many as 724,000 Americans depend on eBay sales for all or part of their income. But it is becoming more difficult to run a profitable business on eBay, as its sales growth slows and fees increase. Sellers are being squeezed between these two factors. In order to thrive in this unique marketplace, sellers need to spend their money wisely, buy goods that will sell at low...