[jelambs]

I sold used golf balls, I was lucky to have a golf course just out the back door. You'd be surprised how many golf balls get abandoned just off the course, so I'd go for a walk after dinner when play slowed down and collect the abandoned balls. Then sell them depending on their quality, some of the valuable ones for upwards of a couple dollars.

Scalable in the sense that supply was consistent. To truly scale, if I were doing it today, I would've built a website providing reviews of different balls and manufactures, so your recommendation for an informational blog. But I think the key here is developing expertise in something by being boots on the ground before trying to build something bigger.