Groupon offers the refurbished Fitbit Flex Wireless Activity and Sleep Tracking Wristband in six colors (Red pictured), model no. FB401, for $49.99. Coupon code "SALE3" drops the price to $40.49. With free shipping, that's $12 under our mention of a new unit from March and the lowest total price we've seen for this activity tracker. (It's a low for a refurb today by $8 and $29 under the best deal we could find for a new one.) Fitbit Flex tracks your daily activity and sleep patterns to help you attain your fitness goals. It comes with large and small wristbands. Deal ends May 19.

No warranty information is provided.