I have used golden harvest with good results also. Are mainstay the ones walmart sells? If it is the ones I am thinking of they say china right on the bottom. There was only a dollar a dozen difference in price. For that I will buy ball jars.
Yes, mainsay says china on the bottom of the box. Daughter is starting to purchase her canning stuff and asked me, as I have always bought ball, I told her I would ask. She is on a tight budget.