AT&T offers the Fitbit Charge HR Fitness Tracker in Black, model no. FB405BK, for $149. Promo code "FITBIT15" cuts it to $126.65. With free shipping, that's the lowest total price we could find by $23, although we saw it for $7 less last week. Features include continuous heart rate monitoring, step-, distance-, and calorie-tracking, and wireless sync with supported computers and smartphones. It's available in size L only.