How much would a Rolling Stone magazine from 1987 with a picture of the Grateful Dead on it be worth?

I found a Rolling Stone magazine from 1987 with a picture of the Grateful Dead on dated July 16-July 30 1987 and would like to know how much it would be worth. I searched on Ebay but couldn't find it. Here's a link to a picture if it helps:a href="http://www.rollingstone.com/photos/gallery/5392229/1987_rolling_stone_covers/photo/14/large/u2" rel="nofollow"http://www.rollingstone.com/photos/galle…/a