I have been using the traditional potting soil + Dome (plastic bag) method to root stem cuttings. It works fine, but just a little messy. It is clearly not 100% and it has a lot to do with myself with the potting media, light, etc....

What about the new Aeroponic cloning system, like the Cloning King machine? It runs about $75 shipping included. I'm not very familiar with it. It appears a lot of people like it.

Or I can improve upon the traditional method. I can get a more sturdy plant propagator with a more solid dome. It runs about $20.