Can you sell products online without using the ebay store and others like them?

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I have seen so many sites where they fill in the store for you and you can sell on ebay but I find when I look at ebay they have all the same products on there. So I wonder how many are really selling that stuff since everyone has the same products on there. I want to sell products but I don't want to have what everyone else has. I have started a site with adding things on daily but wonder if I am going to be able to sell them. Have you done that? Any tips or tricks you can tell me about?