Panasonic Eneloop AA 2100 Cycle Ni-MH Pre-Charged Rechargeable Batteries (Pack of 8) – $15.79 @ Amazon or Walmart

Amazon.com has a pack of 8 Panasonic Eneloop AA 2100 batteries for $15.79. Shipping is free with Prime.
Alterntively, Walmart.com has them for the same price if you don’t have Prime.