https://www.amazon.com/gp/aw/d/B01IQM7TZ2/ref=mp_s_a_1_2?ie=UTF8&qid=1473550010&sr=8-2&pi=SY200_QL40&keywords=dogfish+head+poster&dpPl=1&dpID=51eUl4Awz2L&ref=plSrch

I've seen the one you are looking for recently but it might have sold. I would recommend being pretty specific with Amazon searches. Ebay has a lot of craft beer posters also so try searching on there. I've seen quite a few Dogfish Head posters.