eBay help

How do you report a scam ebay seller?

I bid on three autograph cards the other day, all numbered to /25 or less... and was about to win them all. Then a buyer with zero feedback came in and won them all with astronomical bids at the last minute. The seller only had around 12 things for sale at the time.
Five days later, the same seller has the same three autographed cards #/25 for sale again.

How do I report this cocknocker to eBay???