Amy is a very good seller. If you order IAL from the IBC site they usually come from her.
Anyway if you want to use IAL for the betta to blow his nest under, then grade A or B would be a good choice. If your just going to use it to make good black water for them then grade C or D is good.
I only buy C or D
When I used to buy A, and the betta would blow a nest. By the time they spawn the leaf would be water logged and sink. Messing up the whole bubble nest. But the IAL leaves do help so much, the bubbles stick together so nice..