eBay is always a bit of a risk, although I've had fairly good luck with it, but there are a few things you can do to stay a bit safer:
-Buy through PayPal, and only buy through bank verified people. Getting bank verified isn't hard, but if someone goes through the trouble it at least means they aren't inept. That will weed out a lot of people.
-People with a lot of good reputation will generally be better.
-Watch the shipping, people make some extra cash with flat rates and such. It doesn't mean you need to avoid the flat rates, but, just remember to account for shipping in the price. UPS or FedEX calculator can help you get an idea, and also allow them some room for handling and shipping material (they have to drive to a UPS or FedEX stop maybe, or have to package it, etc.)
eBay is a bit of a process, to really buy something right on there it takes a few weeks of watching things. You'll see the same people selling groups of items and such, and its interesting to see how much people really sell on there. I go back and forth on the value of eBay, because when you factor in your time for using it sometimes the discount doesn't seem to make as much sense. Also, people fall in love with stuff on there. I've sold some things on there and a few of them I couldn't believe how much people bid it up, I've sold somethings on there that went for more than you would buy them new. I couldn't believe it. It's people falling in love with something in the last moments of the auction and not thinking.
Just some things to keep in mind if you go the eBay route. There can be some good finds on there if you keep the right attitude and enjoy the process.