help meeeee

My brother's birthday is in three days. He is asking for audiobooks. I am going to venture the guess that podcasts would also be welcome (though I suspect podfic would not). He is offering zero guidance on which ones. I have no idea what books he already owns in any format, except that he owns a very great deal of Catholic nonfiction in hardcopy, and also some Tolkien. I asked him in September to name a few genres he wants to read in or subjects he wants to be educated on so I would have a place to start. (I know Catholic theology on the "I went to Sunday school with the parish until I got confirmed" level. He knows Catholic theology on the "I have a Master's in theology from Franciscan" level.) He has not responded.

What should I get him, or recommend to him? The less money I need to spend, the better. (Though I assume pointing him at Amazon Music's $0.00 dramatic reading of the KJV is cheating.)