Broke this down into three transactions to maximize the value of Register Rewards and Walgreens Cash:

1. 3 Mountain Dew 12 pks for $9.99.  Used a $5 RR and $5 in Cash Rewards.  OOP 69¢
2. 3 Crest Scope mouthwash (I would have paid the extra buck for the larger size, but only one on the shelf). $4 digital coupon for $9 subtotal. Paid with $5 Cash Rewards and my hot Discover card 🙂  Received $5 RRR.
3. 3 Dr. Pepper 12 pks for $10.99.  Used $5 RR and $5 Wags Cash.  OOP 69¢