The Bowflex SelectTech 1090 Dumbbells drops from $799 to $599, and then to $549 using the code D5DFSU12PB at Bowflex. As a bonus, the code also gives you free shipping and you'll also get a BowFlex Boost Fitness Tracker valued at $49, for free! Without adding the value of the Boost, the free shipping alone makes this the best deal for these dumbbells by $134! Each SelectTech 1080 dumbbell can be adjusted to weigh between 10 and 90 lbs in 5-pound increments and the Boost tracks all your daily activities and calories burned and uploads the information via Bluetooth to the free Bowflex Boost app for your smartphone. You can use the code on the $349 SelectTech 552 Dumbbells as well, to get free shipping and the free Boost, but it won't take the $50 off. Sales tax is charged in most states.