 The Yankees' George Costanza bobblehead doll now reselling for big bucks on eBay. Last Friday night, the Yankees gave out a bobblehead doll of the beloved Seinfeld character played by actor Jason Alexander to the first 18,000 fans at the stadium. As of this afternoon, the dolls were reselling for more than $200 on eBay. Jason Alexander tweeted, I'm so glad bobblehead George was a fan fave.