As one of its daily deals, Groupon offers a Philips PowerLine Alkaline AA Batteries 20-Pack or Philips PowerLine Alkaline AAA Batteries 20-Pack for $7 plus $2.99 for shipping ($0.50 per battery). That's the lowest total price we could find for either pack by $4. Sales tax is added where applicable. Deal ends today.

Of note, you can purchase both packs together for $13 plus $2.99 for shipping ($0.40 per battery), a price low of $7.