OP is completely right that this is bad design because the fundamental issue is NOT that multiple giftcards are being made - the issue is you cannot have a Kind

OP is completely right that this is bad design because the fundamental issue is NOT that multiple giftcards are being made - the issue is you cannot have a Kindle shopping cart. No matter how you spin it, that's Amazon being difficult in the hopes that a few lazy shoppers will "just" buy things as they see it and not track their spending. Likewise, .epub is a garbage format. DRM does not belong on books.