Here’s a thought. Do they really need the cards? If you are using a LDS that is PADI they should be able to look up the records and see that they have the necessary quals to dive. If you are going on a trip check with the shop you are using a get them to confirm that they’ve seen the kid’s records. Might be better than spending the money.
I never got my Dry Suit card and I’m not going to spend the money to get it because the shops I dive with can go onto the PADI system and see that I’ve done the dry suit course.