The Red Sox have seen the shiny new ads for Alex Rodriguez, but before they go shopping they will kick the tires of their tried-and-true Mike Lowell. Deciding to stay with the third baseman could save the Red Sox a very expensive shopping trip. ?We?re going to think long and hard about Mike Lowell; (that?s) where we?re going to be spending our time thinking; that?s where we?re going to be focused,? team president and CEO Larry Lucchino told WEEI yesterday.