I kept costs cheap by buying a floor model light and a new bulb at the local hydro shop for $90, and a closeout cabinet at Office Depot for $30, and spent only $30 on seeds from Nirvana. The exhaust fan was $25 (radio shack), the timer was $9, bulbs were $7 apiece, paint, soil and perlite and nutes and pots and duct tape made up the rest (lowe's and wal-mart). Maybe not under $200 but definitely under $210

I hear what you're saying about 100W HPS not being enough light to produce much bud. So I worked it out: I have 2.53 sqft. of grow space (14" by 24"), and the 100W HPS output is 9500 initial lumens, giving me 3800 lumens/sqft (adequate, probably more than what a lot of growers use). A fringe benefit is that the 100W runs cooler, so I can get away with running one fan, for less noise and more stealth. Basically, I'm not worried about 100W being insufficient. I'm more worried about my germination and female to male ratios from these Northern Lights seeds