boysmom is absolutely correct. Anyone who doubts this should make a trip to 16th Avenue, especially in the summer. It is a disgrace to see cases of milk sitting in the sun outside heimishe stores.
Many years ago when I was in yeshiva, and chalav Yisroel was relatively uncommon, we were told that you could drink plain old Grade A homogenized and pasteurized milk. Now, such milk is available with an OU or a Kaf-K. Nevertheless, if you are makpid on Chalav Yisroel that does not give anyone the right to take advantage of you. Buy it from Fairway or some other store where they understand the concept of refrigeration.