Can confirm that contacting an Amazon rep (via phone or live chat) is the best way to go if you don't want to wait on the email (which in itself can take up to 3 business days). I waited about 5 minutes for a rep using live chat and within 3 minutes after being connected I had my promo code (which i confirmed worked through the redeem site before closing the chat).

They'll just ask you for your order number.

Can't wait to enjoy these once I'm off work. =D