In my quest to eventually retire from finance with some kind of low maintenance business, I did a Google search for “turn key businesses” and got this result:
Here is the rosy self-description of the website:
“Find your next career in our comprehensive business opportunities directory. Below, you’ll also find information on great business opportunities for sale. With turnkey business opportunities in cleaning, food, retail businesses and much more, the opportunities for entrepreneurs are endless!”
I’m not sure if this is the optimal approach, but this seems pretty useful for generating ideas.