Although I'm only an occasional seller on eBay, I second the recommendation.
Our local paper had a series of articles about a young couple who have developed a strong eBay business that nets on average $2,000/month. They began by traveling to a nearby outlet mall and buying up a bunch of clothes designed for teenage/young adult women. Everything they bought was from the 75% off rack, so they were paying very little for the items. (As the teenage trends change in a blink of an eye, this stuff is always on heavy markdown...just check out places like Abercrombie & Fitch, BeBe, American Apparel etc.)
Anyway, they posted the items on eBay, each with a starting price of 99 cents (so their listing costs were low), and soon they were getting sales...but not making too much money. In the article, it mentioned that they then read a book about selling on eBay, and decided to include international sales to see if that would make a difference. That's when their business really took off, with the vast majority of their sales from non-U.S. buyers. They only accept payments by credit card or thru Paypal -- no checks.
Now, they travel once a month to the outlet mall and buy up every piece of teen's clothing they can get on clearance. The funny thing is, when they first walked into the outlet store, they bought those first items as a lark!