Which innovative retail strategy first made the Bible widely affordable to average consumers in the early 20th century?

Throughout history, religious texts have been among the most widely distributed products in the world. Their marketing, production, and distribution have evolved dramatically with technology and cultural shifts. This poll explores a fascinating turning point in how sacred texts were marketed and made accessible to the general public, forever changing their place in consumer culture and religious practice.

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The "Dollar Bible" campaign by the American Bible Society, which standardized pricing across all retailers
Placing Bibles in hotel rooms through the Gideons International distribution model
The "Penny Testament" movement that sold New Testaments for one penny through department stores
Door-to-door subscription model selling Bibles in affordable monthly installments