Hair clippers. I started with a $25 cordless rechargeable one that I got on sale during the pandemic when everything closed down. I recently upgraded to a much better and more powerful corded variant. Looking at how much haircuts are these days plus tips, it definitely has paid for itself multiple times over.

Robot mower. I bought one on sale 4 months ago. It hasn’t paid for itself yet because I’ve only had it for a short while, but I believe within a year it will, with how much time and effort I save for myself. That and my knees and back are thanking it.