Byrne Dairy out of Syracuse has pretty good bottled chocolate milk - but then again, their milk, PERIOD, is some of the best you will ever have. People forget that Central and Upstate NYS is Prime Dairy Country.
This sounds odd, but one of the great milk experiences you can have is at the New York State Fair in Syracuse - in the Dairy Pavilion, they sell 25 cent cups of milk freshly milked and pasteurized from the cows that are at the fair for judging. It is as cold. fresh and good tasting as any milk you will ever have. And, of course, they have chocolate!