Stamina 1690 Power Tower for $88.54 shipped. Here is a screenshot for your reference. It provides the ability perform such exercises as pull-ups, push-ups, sit-ups, chin-ups with multiple grip positions, tricep dips, and vertical knee raises. It measures 50″ x 81.5″ x 41.5″ and weighs 54 pounds. Most places have it for about $109.