First of all, you will need to do your research. This is true with any business. You can do a fair amount for free and there are link on the side that will allow you to do some research for free. I will also post here some tips. Use the completed auction feature inside each sellers listings. This will tell you a finite amount of info on any given seller. Ebay allows a limited search to be done on any seller, after this you must pay. If you want stats going back a month it's free. If you want longer than that you will need to use a service. Terapeak is pretty decent and they have a easy to use interface. |  
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