Purina Beneful Dry Dog Food for $2 Starting 06/25 at Walgreens! Posted by Harbor Master on 22 June 2017, 9:03 am Tweet Expired Starting 06/25, Walgreens will have Purina Beneful on sale two for $10. Buy two for $10 and use two of the $3 off coupons below and pay $4 for two bags or $2 a bag. Click here to print $3 OFF One (1) bag of Purina Beneful Dry Dog Food, any variety (Excludes Purina Beneful Grain Free)