Don't remember what we paid, but I do recall that selling it back, (or to anyone), when preparing the house for sale, was not a good deal. Meaning...the used market is good for these if you are able to find one and are willing to remove it and install it yourself. This was about 2009/10 and I recall selling the stairlift for $500 back to the company that originally sold/installed it. There were a few on Craigslist back then, about the same price. Worth a look.
Edit: Yeah, here's one in MoCo only used a few times....$500:
https://washingtondc.craigslist.org/mld/for/d/olney-bruno-stair-lift-sre-2010-electra/7356894670.html