Groupon is offering a set of 48 Duracell alkaline batteries (24 AA + 24 AAA) for $18.99 with free returns; free shipping with $19.99+ orders.  Limit three per person; additional two as gifts.

2 Duracell StayCharged Chargers and 8 Rechargeable AA Batteries for $29.99. Free Shipping and Free Returns.  Chargers fit both AA and AAA batteries.