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Editor's Notes & Price Research
This fitness tracker clips onto a pocket or belt loop to monitor your activity levels throughout the day. The battery is rated to last 10+ days per charge. -johnny_miller
The cheapest I've seen for a One with all its accessories and some kind of warranty. Note that Groupon doesn't claim a warranty for this item, only a return period.
The One is nice for people (guys, especially) who want the activity tracking but want to wear a real watch or no watch at all or don't want to look oh-so-trendy with a Fitbit.