Banksy put some of his original signed pieces up for sale at a Central Park booth on Saturday for just $60—they have an estimated value of over $40,000 each -- and hardly anyone stopped to buy them. “A lady buys two small canvases for her children, but only after negotiating a 50 percent discount,” Banksy wrote on his website Sunday. The stunt netted $420 on the day. Banksy, who arrived in New York earlier this month, has taken the Big Apple by storm, with some entrepreneurs in Brooklyn charging people to see one of Banksy’s works.