Free 24pk single-use batteries with Harbor Freight coupon

Harbor Freight has coupons in many places these days, including printed glossy magazines. This coupon I spotted in the Valpak envelope coupons that come with the weekly grocery ads in the mailbox. The coupon gets you a FREE 24-pack of single use batteries, AA or AAA, your choice. You can walk into their store and get these for free after coupon. Not sure if you have to pay sales tax. Coupon expires 3/1/18.