No. 2: BlackBerry

Research In Motion's ( RIMM) BlackBerry Curve at Sprint is also battling it out in that market. Nothing in tech gets cut deeper than the price of a three-year-old phone. The best example was the Motorola Razr. The ultrathin trendsetter debuted in 2004 with a $600 price tag, but by 2007, it was a promotional freebie.

The numbers. Best Buy, along with desperate partner Sprint, is giving free Curve phones to people who sign up for two-year service contracts on Black Friday. The phone was recently advertised for $50 to $200.

The stock. Sprint's willingness to subsidize customers' phone costs is a bold strategy to keep and lure customers. Last year, Sprint lost more than 1 million subscribers because of neglected service and rival offers, such as those for AT&T's iPhone. Fewer contract cancellations will be seen as a major accomplishment. And while Sprint shares are well below their one-year high in May, the stock has still doubled this year.

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