Does any sowpuber's operate Amy kind of finders fee business?

I've been looking at ways to use craigslist as a way of creating extra income.

What I found, is that you can find both the buyer and seller right in the same site. That solves a big problem right there. However connecting the buyer and seller while still making a fee is my next hurdle.

For example.

I found a place that has quite a bit a soil it needs to get rid of. And right over in the next county I found a company that's looking to buy that same kind of soil. So I'm wondering how I could set up a finders fee.

Any suggestions?