I understand that there’s less of a demand for them than non-jewish books but you can get a classic mon jewish book for $-34 and jewish ones are close to $20.
Amazon Prime allows you to download to a Kindle (or other reader) a modest selection of “appropriate” books for Jewish kids at a lower cost than purchasing hard copies. The current choices are limited but hopefully will expand as more authors/jewish publihers are willing to put their works online. Adocs has it right….pricing ia entirely a function of supply and demand but hopefully electronic downloads will substantially lower the costs of distribution.