The above references are great resources. An additional resource I use ALOT is a place called Mpire.com, located here ...
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You must register but it is well worth it and does not have any popups or annoyances. After you get in, look on the right hand margin and you'll see the TOP products people are searching for.
Also, I would like to put in a shameless plug on something I put together. It is a tool that you can see what Sellers on eBay have sold and how much. I know eBay Feedback 2.0 includes this now, but it's nice to see it in a nicely organized manner. All searches are free. Here's the link...
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I wish you much success in your new venture! Just be patient and absorb all you can.
Wayne Larimore
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'From 99 cents to $900+ on eBay' - Watch me do it!