Participating Harbor Freight retail locations offer the Thunderbolt AA or AAA Batteries 24-Pack for free with a minimum purchase of $4.99 via this printable coupon. That's a savings of $8 and tied with our April mention as the best deal we could find. Click here to find a location near you. Deal ends August 9.

Of note, you can also get a C 6-Pack, D 6-Pack, or 9V 4-Pack via the same offer.