Took me 200 dollars to set up a small one plant grow.
Don't use 13 watt bulbs. They wont do shit.
500 dollars is a realistic budget.
You will need to build a box or buy a tent to grow in there. 50-150 bucks.
You will need proper lighting. CFL route is still gonna cost you (extention cords, splitters, bulbs). Would be good to use cfl for a month veg and hps light for flowering. Light budget will be 50-200 dollars.
Fans. You will need a fan to blow lightly over your plant or cfl bulbs and you will need and exhaust fan. 30-100 dollars
Smell. Grow northern lights on your first grow to avoid having to buy a carbon filter or a bunch of gel.
Nutrients and soil. 30 - 50 dollars. They should last you 3-4 grows tho.
Then all the incidentals. Pots, timers, trays, etc..
I spent 400 dollars at HTG between two grows just for basic setups. I don't even know how much I spent at walmart and the depot. Shit adds up.