A brief anecdote. McKinnon's meat market in Cambridge sells boneless chicken breasts for $2/lb and split chicken breasts for $1/lb. I'm not an expert and can't speak to the quality, but it's really popular among residents here. I have no idea whether this is an "unrepresentative price sample", but it's a meat market in Boston a few blocks away from the red line. It's not exactly an obscure shop. I've never been there, but I'm thinking about checking it out this week as people keep telling me to go.