If you buy something via one of our links, we may earn a commission. The Lnow 5-in-1 Adjustable Dumbbells are on sale for $130, which is $370 off the original $500 price tag. This piece of workout ...

like the aptly named Used Gym Equipment, Global Fitness, and Primo Fitness. This ready-to-ship adjustable dumbbell can weigh between 5.5–27.5 pounds. While dumbbells are usually sold in pairs ...