Well, in light of all these negative comments about eBay and Paypal, I feel obligated to share my positive experiences.
I once purchased a video card for my computer on eBay. The card was supposed to be new in box. The card arrived, it was used for sure, and also the wrong model. Paypal refunded my money in full and I sent the card back to the person. Price was some where in the rage of $250.
Another occasion I purchased some fitted baseball caps, 2 for $40. The hats arrived and were cheap knock offs of real MLB hats. I was also reimbursed in full and kept the hats, needless to say, they became work hats.