Ebay is hands down the best for me. If you have one base product with a whole lot of variations, you could choose to make separate listings for each one. You could vary the titles, too. That way, when people are searching for a specific item, at least one of yours will show up. Type "Check out my store" in the description and voila! I've had 800 hits so far doing this in 3 days. Not bad as I have just one product.
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