walmart has the 65 watt fluorex on sale for $12. Heck the price of a new bulb for one of those lights is $10. Or get some 4" shop lights for $20, plus a couple of bulbs for it. Fluoros are the cheapest to run and easiest to maintain, since they doin't get hot like the hps lights.

Yes, you can use the sun to grow your plants. You will also need to supplement with artificial light to expand the daylight hours and get enough lumens to the plant. I put my soil grows outside during the day. But I only have 4 plants right now. I also use 24/0 lights for veg cycle.