Newegg offers the Fujitsu AAA Rechargeable Battery 4-Pack, model no. LR03(4B)FP-W-FI, for $5. This $5 mail-in rebate drops it to $0. With $2.99 for shipping, that's $10 off list and the lowest total price we could find. They purportedlyd hold 95% of their charge over 10 years in storage. Deal ends January 27.