Autographed Michael Brantley ball: Any value?

I'm a Red Sox fan living in Ohio, so any time the Sox are at the jake, I try to get up there.

Last year, I was sitting in the left-field bleachers (Best $10 seats in the majors) and a ball came flying up into the stands. I managed to grab it, and noticed that Brantley had signed it and tossed it up.

Obviously, being a Sox fan, it's got no sentimental value to me, so I was wondering if it was worth anything monetarily.

Here's a pic, excuse the crappy cellphone camera.