I have about 300 watts of cfls going to sustain my grow and they are working well, currently flowering.
My electric company is expensive too. Ontario
Anyway, that only costs me 20 BUCKS a month. If you used 1 26w daylight cfl in a dome (i will post the pic) then you are talking 2 bucks a month TOPS.
Light: 5.00 26w DAYLIGHT (for vege)
Dome: 7.00 7-12 inches
Electric: 2.00 (thats expensive talking)
Keep in mind you can only vegetate for as long as how much light you have. Therefore this light and dome will only get you to about 6 inches high or so before you MUST flower. Even that will yield kinda junky buds. So this one light is only going to last you 2 weeks from seed before it becomes useless without some more bulbs.