Amazon has the Bowflex SelectTech 552 Adjustable Dumbbells (Pair) (Model: 100182) for $314.99 with free shipping. The SelectTech 552 feature a sleek style that do not have to be hidden deep inside a closet after each workout. The Bowflex combines 15 sets of weights by utilizing a dial system. With a slight twist of the dial, you automatically change resistance. The weight is increased in 2.5-pound increments.