5K+ bought in past month. Amazon has the Used - Like New 24-pack AmazonBasics AAA NiMH High-Capacity 850mAh Precharged Rechargeable Batteries on sale for $14 - 5% off with Subscribe & Save (can cancel at any time) = $13 with free shipping on $35+ or with Prime. Roughly 54 cents per battery. Can be recharged up to 500 times.