If you are trying to avoid credit card fees for multiple transactions you could purchase a gift card and then use the gift card to purchase your books. This way there is only 1 transaction on your credit card.
With the promotion codes - if they are valid for multiple uses then simply continue to reuse the code for your next purchase. If the code is only a single use code then it is only valid for one book.
Kobo does provide quite a lot of codes and the Kobobooks.com Discount Codes thread maintained by Goat which is normally on the first page is the place to find them. In the OP there are tips for getting multiple uses out of country specific codes.
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