Bowflex offers its Bowflex SelectTech 1090 Adjustable Dumbbells for $599. Apply coupon code "D5DFSU12PB" to cut the price to $549. Better yet, that same code bags a freeBowflex Boost Activity Tracker. With free shipping, that's $57 under the lowest total price we could find for these items purchased separately, although we saw the dumbbells alone for $150 less in September. The dumbbells include 15 settings on each dumbbell with an adjustable dial system for weights of 10 to 90 lbs. The activity tracker logs calories, steps, distance traveled, and sleep with a purported 11-day battery life.