Even if you're an ascetic who eschews the materialism of holiday shopping, the Black Friday and Cyber Monday juggernaut is hard to avoid. Stores hawk their deals everywhere, promotional emails flood your inbox, tweets and even texts tell you what to buy, and where, for the best price. But before you give in to the siren's song of cheap fitness trackers, keep in mind that online scams are lurking everywhere. And the threat is greater this year than ever.

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