Adjustable Dumbbells: Panmax Adjustable Dumbbells Barbell Set of 2 You could get a bunch of different-size weights, or you could splurge on this Panmax Adjustable Dumbbells Barbell Set of 2 ($88, originally $140). Image Source: amazon.com Panmax Adjustable Dumbbells Barbell Set of 2 $88 from amazon.com Buy Now