As one of its daily deals, CowBoom offers the used Samsung Gear Fit Fitness Tracker and Smartwatch in Black, model no. SM-R3500ZKAXAR, for $29.99 with free shipping. That's $15 under our October mention of a used unit and the lowest total price we've seen. (It's $49 under the best price we could find for a new unit.) It features a curved 1.8" Super AMOLED display, heart rate sensor, and notification of emails, SMS, and incoming calls. It's compatible with most Samsung mobile devices. Deal ends today.
Note: No warranty information is provided. This used unit may have dents or scratches.