Amazon has 30-Count Purina Pro Plan FortiFlora Probiotic Supplement for Cats on sale for $30.99 - 35% off when you 'clip' the coupon on product page - 5% off when you checkout via Subscribe & Save = $18.59. Shipping is free with Prime or on $35+ orders.

Thanks to Staff Member Meowssi for finding this deal.

Note: You must be logged into your account. Coupons are typically one use per account. You have the flexibility to manage your Subscribe & Save subscription at any time after your order ships. View Subscribe & Save filler items and our current Subscribe & Save Frontpage deals to unlock up to an extra 15% savings when you have 5 or more items in your current monthly subscription.