Should I hold them to the price?

I recently found a set of Polished MP Magnum Valve covers brand new on ebay listed for $20.85, so I jumped on it. I knew it was probably a typo. Sure enough, after I paid, they sent me a message saying that the auction was for gaskets. I went back and looked, and it clearly said Polished aluminum valve covers, gaskets must be ordered separately. Should I hold them to it, or take the refund?