One easy way to save money on batteries is to purchase a charger and rechargeable batteries. Today, you can order an iGo Charger with 12 AA and 8 AAA rechargeable batteries for $15.99. Shipping is a flat rate of $5, making it just $21.99!
You can find the same charger with 4 AA batteries for $8.93 on Amazon. You can also check out the reviews as well, where it has 4 out of 5 stars.