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A pair of Bowflex SelectTech 552 Adjustable Dumbbells drops from the retail price of $549 to $279.99 with free shipping at Amazon. This is the best price we could find for this pair by $20. Each dumbbell can be adjusted to weigh between 5 and 52 lbs in 2.5-pound increments. It comes with a 2-year warranty and sales tax is charged in most states.