Although the cost can be significant, this home modification offers an improved quality of life for people who use it. The device may allow someone with limited mobility to continue living at home longer. And, when compared to the cost of an assisted living facility, a stair lift is by far the more affordable option.
There are many factors that influence the decision and cost. Here is an article from an objective third party that should answer your questions about purchase and rental options, features, costs, and potential help with expenses: