Heck, The small online shop where I bought my robot lawnmower does this. Last year I bought replacement knifes for the robot. This year they sent me a mail at

Heck, The small online shop where I bought my robot lawnmower does this. Last year I bought replacement knifes for the robot. This year they sent me a mail at the same time, asking if I wanted to buy another pair of replacement knifes, or perhaps other accessories or a new battery. And yes, I wanted another set of knifes - click, done.