I just talked to Den Besten Farm the other day--chickens are done on Thursdays and Saturday mornings, but prefer you bring them in on Thurs. They said to call for an appointment and the price per bird was $5
(BTW, if anyone knows of a processing place closer to Sturbridge, I'd forever be in debt! I have 5 Cornish that need to be packaged before I leave for Syracuse in a few weeks)