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Amazon [amazon.com] has 8-Pk Panasonic eneloop AAA Rechargeable 800mAh Ni-MH Batteries for $15.99. Shipping is free w/ Prime or on $35+.

Product Description from Amazon:[list][*]LONG LASTING PERFORMANCE: Recharge eneloop AAA rechargeable batteries up to 2100 times[*]POWERFUL NiMH RECHARGEABLE BATTERIES: eneloop AAA Ni-MH pre-charged rechargeable battery deliver up to 850mAh typical, 800mAh minimum