which is the best online business to start with a $100?

I agree with the previous posters. You can't just say - I have $100 - now what is the best script / site / theme to profit from. I think you have to decide what you enjoy, what you are knowledgeable or passionate about, and then make the decision from that. That is how successful web-entrepreneurs think!

 

Lots of good ideas and suggestions. I can't offer anything that hasn't been presented here already, but $100 is not enough to do anything if that's all you have. You can actually begin with nothing if you can write with clarity. There is a way to begin by article writing and it will take both time and patience. Keep looking and you will find your way into it. Be careful, lots of people waiting to get your $100...