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Amazon [amazon.com] has 30 count Zesty Paws Probiotic for Dogs – Probiotics for Gut Flora, Digestive Health, Occasional Diarrhea & Bowel Support – Clinically Studied DE111 – Functional Dog Supplement Soft Chews for Pet Immune System for $ 5 (from $ 9.99) with code W6XB6BI5. Shipping is free with Prime.