I am in SE Texas, use to have a huge scorpion problem. The number one thing they are attracted to and willing to risk coming in for is water. Make sure you keep drains from leaking and such. Also they don't like cold, I keep my place fairly chilly in the summer, (I know not everyone can) but bugs prefer warmth. A cold house keeps bugs away, most kinds of bugs anyways.
A natural poison would diamogeous earth, its a powder, if you can carefully put in the corners, along the wall, under bed. But it can take several days to actually kill it. You can buy it at home depot or walmart. Make sure you read the direction, the powder is very very fine be careful when handling it or breathing around it.
But over all the cheapest and best is the shoe method. I don't know if scorpions actually talk to one another, but the more you kill the less you have. And they go away when spiders (their natural enemy) populate and begin killing them off. So on the animal chain, there really isn't a win. Sorry.