Just about everything the cannabis community use is merely repackaged and over-priced starting with nutes and supplements then going down the line to all the other things we use. A few hours with a good search engine can save you a lot of money.
Electrical stimulation has been experimented with and has shown interesting results but I haven't any recent major studies. Magnetic effects, as far as I know, are still in the area of wild assed guessing.
Just to help people along, sativa's tend to improve with maturity. If you grab a clone for a mother you will actually get a better plant from the later clones. I've had very good results in the past from 1+ year old sativa mothers.