Woot offers PowerBlock 50 lb Adjustable Dumbbell Set for $249.99 (orig. $499.99). Free shipping for Prime Members.

Product Description:
Pack big weight into small space with the PowerBlock® 50 lb. Adjustable Dumbbell Set. The advanced design reduces clutter and substitutes nine pairs of dumbbells in the space of one. Featuring a patented selector pin for easy adjustment, the set adapts like a selector stack machine you’d see at the gym. With a weight range of 10 to 50 lbs., this compact set allows you to sculpt muscles from the comfort of your home.

• Adjustable dumbbell set (2 total dumbbells that are 50 lb each)
• Increments: 10, 15, 20, 25, 30, 35, 40, 45, 50 lbs. per hand
• Patented selector pin adjusts weight in seconds like a weight stack machine
• Space-saving design eliminates workout clutter
• Has a weight range of 10 to 50 lbs.
• Replaces 9 pairs of dumbbells in the space of 1
• Non-Expandable
• Style :503-00185-02