There is a difference between getting something for cheap and getting what you want. Check a person's feedback to see how satisfied other customers were with their experience. If the feedback is high, you are probably dealing with a credible person. Another way to check a person's realibilty is to see if they are a top-rated seller. This is ebay's highest rating. This means the person is top notch. Please keep this in mind to ensure a pleasant transaction and being happy at the end.