You gotta watch how much you pay on Ebay though. Personally, I wont pay over 50% of what the item costs when new if Im buying off of Ebay.
You can do pretty good on Ebay, you just gotta know what the item is really worth and you have to be patient. Ive lost more items than Ive won from Ebay, but I go into it with a set price in mind and if it goes over my price, I let it go. Youd be surprised what people will pay for stuff on Ebay.
Last winter I was in the market for a Team roller secondary. I had a set price of $150 in mind. I lost several clutches because you had people who would pay $200-$300 for them. Why would I pay $200-$300 for a used Team clutch when I could order a brand new one for $300? Some people are just silly...