Three Pound Purina One SmartBlend Dry Dog Food for $3.50 at the Dollar General through 05/20 Posted by Harbor Master on 15 May 2017, 3:10 pm Tweet Expired Click here to print $1.50 Off one bag of Purina ONE SmartBlend dry dog food, any size, any variety Through 05/20, The Dollar General has 3lb Purina One SmartBlend Dry Dog Food on sale for $5. $3.50 after the coupon above.