Baseball or history lover? Both? You can save money while helping Boston’s Fenway Park celebrate its centenary. The Green Monster turned 100 on April 20, but the deal lasts all season. The Hotel Commonwealth is offering a special 100th Anniversary Package priced from $339 to $479 a night during the 2012 Boston Red Sox season. The package includes lodging for two in a superior deluxe Fenway Room (470 square feet) with direct views of the ball field; two tickets to the official Fenway Park Tour’ a 50-minute walking tour; and a welcome basket of Baby Ruth candy bars, Coke in old-fashioned bottles, boxes of Cracker Jack and stacks of baseball cards. This deal must be booked by phone rather than online. The deal is widely available from June through September but pricier on nights the Red Sox are at home. For a one-or two-night stay June 22, 23 or 24 or July 7 or 8, the package costs $499 a night (pretax). Sept. 23-25, when the Red Sox play their last home games, the rate is $409 a night. Hotel Commonwealth, 500 Commonwealth Ave., Boston; 866-784-4000;