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Product: Flat-screen TVs
Big brand: Samsung ($1,700 for a 46-inch LED-LCD TV)
Savings (per unit): 18%
Store brand: Best Buy's Insignia ($1,400 for a similar TV)
Most key components are made by the same few companies, says Dan Ackerman of cnet.com.
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Last updated May 12 2010: 10:39 AM ET