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Big brand: Duracell ($12.99 for 36 AA batteries)
Savings (per unit): 42%
Store brand: Costco's Kirkland ($9.98 for 48 AA batteries
"Costco's Kirkland brand is just as good as Duracell," Steenkamp says.
NEXT: 81. Best times to skip big brands
Last updated May 12 2010: 10:39 AM ET
Source: Costco in Mount Laurel, N.J.