I am currently growing 6 Sk-1 plants in bubblers, and I think it cost me like $50 (US) and it is growing great! 2 weeks from sprouts and all about 4" high and BIG leaves (6" across tip to tip), now in that price I did not include the cost of nutes, since I'm not sure how much it will cost by the time I'm done.

http://www.overgrow.com/article/2

that is a good article to get you started, I took the same idea, but used rubbermaid totes (10 gal.)

good luck