I have found someone willing to ship me a certain brand of headphones. They are offering me one unit for $55 plus $28 shipping. However, for five units the shipping is free. I have a really bad feeling about this. Are such offers common? As it feels like they are offering the free shipping on a number of units which is tempting enough to not care about the risks. Instead of working up from 1 unit to 2 to 3 etc you go from 1 to 5. All payment through Paypal and my credit card if that helps and I have seen pictures of the headphones on a webcam by the company so they definately have them. They are fake too if that means anything. Any adivce.