Used stair lifts are purchased from individuals who no longer need a stairlift in their homes. We buy the units, inspect all components to ensure they are in good working condition and safe for in-home use, replace the unit's existing battery with a new one, and resell them to our customers. A used stair lift  is a great alternative to purchasing a new unit at full price, especially if you have a straight staircase that requires little customization.