Bowflex SelectTech 552 Adjustable Dumbbells (Pair)

$249.99 (as of January 21, 2019, 4:19 am) $247.99

Each dumbbell adjusts from 5 to 52.5 pounds; adjusts in 2.5-pound increments up to the first 25 pounds
Lets you rapidly switch from one exercise to the next
Combines 15 sets of weights into one, using a unique dial system

Usually ships in 24 hours