The cheapest, easiest way I have found is to snip a piece off,after it has matured (6-8 wks old) and tossing it in water. After one-two weeks they will sprout roots. Some say to change the water daily (tap always works for me), but I have tested that theory and found (for any strain I have tried myself) every two-three days is fine.
I built one of these and so far have rooted every cutting that I've put into it. http://forum.grasscity.com/do-yourself/444974-lets-build-clone-machine-*step-step*.html
THE BEST MOTHOD!!!! i dont care what anybody says http://forum.grasscity.com/do-yourself/444974-lets-build-clone-machine-*step-step*.html
lol sorry forgot to post earlier today, should have refreshed first. just reinforces the awesomeness that is rumps cloning bucket