If you’ve ever stopped by a convenience store on the way home to buy just a pair of AA batteries, you’ll know just what a racket that is. Costing as much as $5-$6 a pair, these things can get ridiculously expensive if not bought at the right time and place. Like now. You’re looking at a kit of 100 AA and 52 AAA Duracell batteries, and they’re going for $59.99. That works out to around 34 cents a piece, rather than the $2-$3 they can sometimes cost. The batteries are good until 2019, so it’s not like you’re buying old, unsold stuff.