https://electronics.woot.com/offers/4-pack-amazonbasics-2400mah-nimh-rechargeable-aa-batteries 4-Count AmazonBasics 2400 mAh NiMH Rechargeable AA Batteries on sale for $3.99. Shipping is free for Amazon Prime Members (must login with your Amazon account and select a shipping address in order for Woot to apply free shipping) or is otherwise $6 per order.