Which religious consumer product innovation from the 15th century revolutionized access to sacred texts and is often credited with helping spark the Protestant Reformation?

Throughout history, religious institutions have played fascinating roles in commerce and consumer culture. From monastery-made products to sacred souvenirs, the intersection of faith and retail has shaped economic systems across civilizations. This trivia question explores a significant historical development in religious retail that transformed how spiritual products were distributed to the faithful.

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Gutenberg's printed Bible, which made scriptures affordable to the middle class
Mass-produced religious medallions that replaced hand-crafted relics
Standardized prayer beads that allowed for consistent pricing across monasteries
The first church-sanctioned mail-order catalog for religious items