Groupon deal on Duracell batteries: as little as $0.35 per battery

I've been buying batteries at Costco since The Dawn of Time, thinking that, aside from a coupon stacked with a sale, there was no better deal on batteries than at Costco.  So, when I saw this Groupon deal on batteries,  I took a quick look at Costco.com and discovered that their $14.99-for-32-Duracell-batteries deal on batteries basically came to $0.47 per battery. 

I was pretty surprised to discover that Groupon has a slightly better deal when you buy one set:  $16.99 + $3.99 shipping = $20.98 for 24 Duracell AAAs and 24 Duracell AAs, or $0.44 per battery. However, when you buy two sets of these batteries, the shipping is free, so it becomes $33.98 for 96 batteries, or $0.35 per battery. 

That's significantly less (25%) than the Costco price.  And yes, I'm buying two sets; that's a really good deal.

Limit 3 per person, may buy 2 more as gifts. Free returns.

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