As a Cyber Monday Deal, Amazon is discounting POWEROWL rechargeable AA and AAA batteries, and chargers. For many items, you can stack a 10% coupon on the product page with the Cyber Monday discounts.
See the list of discounted POWEROWL items at Amazon, discounted to as low as $1.28 per 2800 mAh AA battery.
You can also consider Amazon Basics rechargeable batteries which are also steeply discounted today, but have lower capacity at 2000 mAh and 2400 mAh.