The list does not change all that much, but if you actually get the emails, you will see that generally there is a paragraph like this:
taken from yesterday's 50% coupon
Quote:
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* Offer valid from December 15 at 12:00 AM through to December 15 at 11:59 PM. This offer is not valid in conjunction with any other offer or promotion and cannot be used to adjust amount paid on previous purchases. Discount code is valid for 50% off an individual eBook purchase excluding eBooks from Hachette, Grand Central, Warner, and Little Brown. Newspapers and magazines are excluded from this offer. Promotional code must be entered at time of purchase to qualify for this discount. Discounts cannot be applied nor the discount value refunded once a purchase is complete. We reserve the right to change or end this offer at any time without notice.
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What that translates into, is that the offer is good on any non-Agency priced book. Generally this means that if two prices are listed for a book (a suggested and a discount price) you can use the coupon code.