Does Dad like to read? If so, you should think about signing him up (and paying for, of course) for an Audible membership! This is one of those things that Dad may have been wanting for a while, but refusing to buy for himself. Us parents do that, you know?
If he doesn’t don’t love audible, be sure to cancel at your 30 day expiration date. Otherwise your account will automatically renew at the $14.99 monthly rate.