Talented people can buy used ones, adapt them, and install them.
I’ve helped a few friends do it for under $1k. It winds up taking hours of my time, and hours of their time. If you include a reasonable labor rate for yourself, and the mechanically inclined friend that helps you, whether they charge you or not, it winds up costing about what a retail lift with professional install costs. A mechanic will charge about $100/hour, just like an electrician or plumber.
Nothing is free unless you’re a freeloader. If you are abusing your friends, you are not their friend.
Helping a close relative.
I did just look on Craigslist. It may be worth making a few calls.