Finding appropriate food couldn't be any easier in this day and age. You can check out the MANY vendors on kingsnake.com to find suppliers of rats and rabbits (I personally recommend Rodentpro.com, Kelly Haller, Bayou Rodents just to name a few)....they'll ship the food right to your door so there's no excuse to not feed a quality and appropriate diet. To answer your question, yes, a burm will take a "grocery store turkey" or chicken"; in fact, they'll probably love them but that doesn't mean you should feed this type of food to them. As an occasional treat, I suppose it's fine but do your snake a favor and find a supplier of rats and rabbits and give your snake a whole animal diet. Now if you are feeding whole chickens or turkey that is one thing but even then, rodents seem to be a better diet.