i love Ebay... i've both bought and sold numorous things on it. the biggest thing is DO YOUR RESEARCH... you cant impulse buy on Ebay, you have to know about how much it should be selling for and know the history from the person your buying from... (i shouldnt be letting all my secrets out... but for my fellow FPers..) also make sure you READ the whole listing! be warry of as-is, no returns, zero feedback/new sellers.
If the price is too good to be true... it prolly is (broken, not the right item, stolen, something wrong with it)