Mets general manager Sandy Alderson is shopping at least three members of his bullpen as the July 31 non-waiver trade deadline nears, according to sources. Alderson and his staff have made clear to other teams that they are shopping closer Francisco Rodriguez, setup man Jason Isringhausen and lefthanded specialist Tim Byrdak. "They are really trying to move Isringhausen, and also Byrdak and K-Rod (before the July 31 non-waiver trade deadline)," one of the sources said. "Those guys have pitched well, and they could help somebody."