From Dogfish site:
"Dogfish's Bitches Brew was released in 750ml bottles on 8/31/2010 to Dogfish wholesalers in the following states: AZ, CA, CO, CT, DC, DE, FL, GA, IL, IN. MA, MD. ME, NC, NJ, NV, NY, OH, OR, PA, RI, VA, VT, WA, and WI"
Doesn't look like it's available here