Tanga offers the refurbished Nike+ Fuelband SE Activity Tracker in four colors (Black pictured) for $29.99 plus $4.99 for shipping. That's tied with our mention from two weeks ago as the the lowest total price we've seen for it in any condition. (It's the best deal for a refurb today by $13.) This water-resistant tracker features a 100-LED display, ambient light sensor, Bluetooth 4.0, USB, and activity and sleep tracking. It's available in sizes S to XL, although not in all size/color combinations.
Note: A 30-day warranty applies, but it's unclear who covers it.