A last word, for all those thinking they don’t want to spend any or little money, if you want to grow right, even if it is just one plant, this will cost you some money. If you don’t get enough light your plants will not grow right and even if you manage to reach harvest you will not end up with much. If somehow you can get anything off a 10$ budget then you’ve got two green thumbs, toes and some kinda weed angel looking over you.
Growing when done right can be an expensive hobby and requires a lot of time and patience. If you are doing this as a random experiment to see what happens then go for it, your plant might not make it too far but youll gather a lot of information.
So if you’re going to grow do it right from the start. If you invest 100$ then you should easily get at least that much back in bud (not saying you should sell but rather money saved in not having to buy your own) after your first grow with one plant. That and you will be able to use your setup over and over again. Also if youre anything like most growers youll get into it real fast and love doing it. Then spending some money wont just be seen as a necessity but youll want to improve wherever you can anyways and not mind spend the extra $ here and there.
With that said, keep gathering information and good luck!

__________________
Beginners guide to growing indoors: http://www.rollitup.org/newbie-central/26569-beginners-guide-indoor-growing.html