Anyone selling a single physical product in their local city/town and making decent money from it?

As the title says, I would like to find out if anyone is selling a single physical product in their local community and actually earning decent money from it? I’m not asking about retail store owners who are selling many different kinds of products, but rather people who are selling a single product kind, such as toothbrushes, bleach or toilet paper for example.

• Are you producing it yourself, or just buying in bulk and re-selling in your community for a profit?
• What kind of product is it that you’re selling?
• How do you market your product to potential customers?
• Are you selling B2B (retail stores, supermarkets, etc.) or B2C?
• Are you selling from a webshop or in-person, such as at a market?

The reason for me asking, is that I’ve always had an interest in producing and selling a single physical product (take toothbrushes for example) and seeing if I can make enough money from it to live off of. I’m keen to give it a try but first want to find out if anyone else has experience and can share some advice around this. Thanks in advance!