If you pay via paypal tell them. A few or so ago i brought a cd that had a lot of PSP software. It was $6, he scammed me them my brother sent PayPal a message on my behalf saying what happened and then he sent the guy that scammed me a message saying he will have to pay a fine if he didn't send it to me. What do you know i waited 2 days and it came in the mail.
The moral of this story is
-Pay via PayPal.
-Always check the feedback.
-Look in the feedback, see if he/she has got good feedback for buying OR selling. Check what some of the items are. I think myself that people just buy 1000 items that cost $0.01 ea. The get 1000 positive feedback then they scam people.
-Do NOT buy the item if it's too good to be true, it is probably a scam.
-If you are not sure about an item just send me the link and I'll check it to make sure you wont be scammed.