Very popular rechargeable batteries are now $18.36 with free shipping from eBay digidirect store using below code.
PANASONIC ENELOOP AAA - 4 PK
Provides high power performance down to sub-zero temperatures (as low as -20°C).
Can be recharged up to 2100 times.
Factory pre-charged by solar energy and ready to use right out of the package.
Maintain 70% of their charge after 1 year of storage.
No memory effect - batteries can be recharged when fully or partially drained.