Also available is the Duracell Pre-Charged Rechargeable AAA Batteries 4-Pack, model no. AAA-RCHG-STAYx4, for $7.66 with free shipping via clippable coupon on the product page as well as Subscribe & Save. That's several cents under our February mention and the lowest total price we could find by $9. Be sure to cancel Subscribe & Save after your order ships, or you'll be charged for subsequent shipments.
Amazon Prime membership is $79 per year; however, Prime is free for college students for six months, and free for parents and caregivers for three months. (There is currently a waitlist for Amazon Mom.)