If you haven't yet, please download our DVD Marketing Guide by clicking on the 'Bonus Guides *New*' link on the left-hand side of the page. It has a list of recommended suppliers and some excellent tips on how to source and market these products.
Also, have a look at this related post. It also has a list of recommended suppliers that you might be interested in dealing with.
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It is also important to note that eBay is a wholesale marketplace. Wholesale suppliers sell through eBay. Other eBay sellers who are able to offer products really cheap either buy through liquidators or buy in really huge quantities to get the best price.
All the best,