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For $100, you could do thrift store arbitrage. There are thrift stores around my neighborhood that sell items for under $1 or $5 that could easily go for $10 to $10 on eBay or Cragislist. You could buy $100 worth of items, and sell them for $200 online. This works for small dollar amounts but is harder to scale because you will spend more and more time shopping and shipping.

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I know thrift stores in a particular part of the Bay Area where college students dump clothes with labels like Armani and Versace because they bought too much / can't take it home with them when then move out. I would think women's shoes and handbags would be another area, but would require more specialized knowledge/research.

Lightly-used items can be sold on eBay, while vintage items can be sold on Etsy.

After that, cars and pickups trucks can also be arbitraged by going to car auctions and watching Craigslist. It especially helps if you know a mechanic well or are a mechanic.

The next step is arbitraging small businesses and real estate.

Beyond that, you need to slowly build a real portfolio of defensible business investments.

I was thinking arbitrage too. But from the perspective of buying ads where you find a way to make more money from the traffic than the ads cost.

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