It is currently sold at hundreds of grocery stores nationwide, including large chains like Kroger, Walmart, Albertsons, H-E-B, Ingles and Natural Grocers. It also is available on their website. The Postum product lineup of today is larger than that available to consumers decades ago.
Drinking tea is against the Word of Wisdom, the official doctrine of The Church of Jesus Christ of Latter-day Saints. The Word of Wisdom is the label Mormons use to refer to a revelation received by Joseph Smith on February 27, 1833. This revelation is Section 89 in the Doctrine and Covenants, a book of scripture.