I'm sure it is a simple process but I have a 'pushy' buyer who is hassling me for a much lower start price and free delivery contrary to my listing. On being told by me that i am not prepared to change my start price and the postage stays as listed..he/she made a comment "sorry to bother you, I thought this item was for sale!"

Frankly I don't want to deal with them as any deal would end in tears from this start point. I believe Ebay is all about goodwill between buyers and sellers and I don't want to deal with sharp hotshots...how do I bar them from my buyers list?