Hey! I found this for you and although I wasn’t able to find a medal or prayer card I would recommend reading up on him and his history there is a link at this little nuns blog for him, here is the link http://asksistermarymartha.blogspot.com/2009/12/raining-not-kats-and-dogs.html
I know you probably have hundreds but you might want to get your son a special set of Rosary Beads for his Confirmation if you can’t find a medal or even if you can. Anyway, I got a kick out of the blog link I gave you and I hope you have a little smile after reading it too, it made me think of Mother Angelica!
With Love in Christ,