I would recommend compact florescents, 30W 1650 Lumen is 4.1$ in here, you may want to use 42W CFL as well. They are relatively cheap and produce fair light, requires less electricity and creates less excess heat. Rule of thumb is you'll need between 1000 and 3000 lumens per square foot of space in your grow room. You can use a box or a closet to reduce the area thus use less light. My recommendation is 2000 lumens per square foot which is fair enough for a healthy growth.
Lights are your biggest expense as well as soil, rest is cheap if you have a closet, paint interior to plain white. Start seedlings in small plastic glasses and go for 1 litre pots then go for 12 litre ones. This will also cut down your expense on soil material as well as when your plant dies, it takes less soil with it.
For ventilation, use computer case fans which are 4.1$ as well, a small room can be aerated as well as ventilated by using an intake and an exhaust fan. Total set up with other necessities such as soil, pots, nutrients will cost you around 30USD to 60USD depending on the size of your grow room/closet.
Do not expect super buds, do not expect perfect growth, expect to have good buds and fair yield for your expenses.