SharkStores offers the 2nd-Generation Jawbone UP Fitness Tracker in six colors (Onyx pictured) for $79.95. Coupon code "JB20UP" cuts it to $59.95. With free shipping, that's the lowest total price we could find by $17, outside of the price below. It's compatible with the Amazon Fire phone, Android 4.0 or later devices, or iOS 6.0 or later devices. It's available in sizes S to L.
A close price: EStock via Amazon offers it for $62 with free shipping.