Yeah, I ended up spending way more on my plants than I would have thought. Containers, lights, fertilizer, crap to build my grow room, a vent fan, timers, power strips, extension cords, bulbs, soil, seeds, insecticide, etc. I think I've spent about $400 on my setup so far, and it's a small one.

Granted, you can grow low-odor strains with fluorescent lights, or grow autoflowering plants, and you probably wouldn't even notice a change in your power bill, but you WILL end up spending more than you think on growing indoors.