there are many competitors but they are not up to the mark, one of site like ebay is ubid.com, you better choose amazon an alternative to ebay.
Bay is better is till better for selling items worldwide. ebid ziing also going good, but not like eBay. if you are interested also you can use amazon.
Have you seen the amount of money they charge . 2ndly you pay for every single listing and they show tons of links and images on your listing drive customers from your business to other . UNFAIR totally utally UNFAIR
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I'd say ebay (since that's where I started and made most of my money from), but it seems like amazon is surpassing ebay.