Coupons do not apply to prime items. This is so that prime members always get the best value on those items, and therefore make the membership worth the price. Prime is a great value...you get discounts that no other members get on items like this one, extra discounts in sales, coupon each month, FREEBIE each month (this month there are multiple freebies for the anniversary celebration) etc. So we do not allow coupons to apply to those items so that the prime price is the best possible price.