Amazon discounts a selection of batteries via Subscribe & Save, as mentioned below. With free shipping
on all items, that's $2 under the lowest total price we could find for any of these packs elsewhere. The deals:
Of note, if you're paying by MasterCard, apply coupon code "MSTRCRD1" to cut a further 10% off.
Be sure to cancel Subscribe & Save once your order ships to avoid being billed for subsequent shipments.