A man walks into a hardware store in the SF bay area. He looks around, puzzled. The female employee notices his confusion and offers assistance. "How much is three?", he asks, as he holds up something of interest. "Twenty five cents", she answered. "How about 260?" "Ummmmm sir, that will be around 75 cents". He thinks about it for a few minutes, and decides to buy 13. He sees the same girl at the checkout, she smiles at him and charges him 54 cents. He smiles back, and goes on his merry way.
What did he buy?