You can't get it anywhere now unless you are willing to buy a vintage bottle and pay out the ass. They didn't have one last year because they had to dump 2 batches of it. I have heard they should be shipping this years in April or May.
I bought my first one Saturday (which was also my first brew day) the bottle was dusty and I beleive the bottoling date was in December of 09. Great beer, deffinately a sipper. First beer I drank out of my mix six and it had me feeling good.
Periodically check with Bubbles in Castle Rock, they usually have most of the Dogfish beers. I have three 120 minutes I bought from there in addition to a bottle of Red & White that was outstanding. If you've never been, it's across the street from the Rockyard brewery/restaurant.