Try small middle eastern stores. I buy it in a Moroccan family owned supermarket like store in one quart cartons. It is from concentrate, so arguably the health food fresh pressed version is a little better, but most of the health benefits are still there in this much cheaper version. Do try to find one that is unsweetened.
Have your father eat lots of cruciferous vegetables as well (broccoli, cauliflower, cabbage, brussels sprouts, kale etc.). That has also been shown to help slow the growth. You could also juice them (in addition to eating them with meals).
This must be a hard time for all of you. I wish you strength.
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