If we only published in one language, and only in one format, we could easily answer the question.  Bible Societies work in hundreds of languages and many formats. Some Bibles are printed for as little as $4, others, like Braille Bibles, weigh tens of kilograms and cost hundreds of dollars. Bible translation projects can take from 15 to 30 years to complete; and when Bibles are printed, the cost of these is not just the $15 we might pay a printer, but $15 plus the cost of years of translation work. Some Bibles may in fact cost over $500 per Bible to translate, publish and distribute, but they are sold at greatly subsidised prices, and some are given freely. This is only possible through the generous support of both churches and individuals.