Well before you grow you really should have a plan, and set up going ready to use. You can go to HTG or there are other sites just as great, each has it's own deals. Here are a few I've used in the past. This one has the cheapest inline fans I've seen: plantlightinghydroponics Dotcom, This one has good price on reflectors: cheaphydroponics Dotcom. There may even be a hydroponics store in your town, or near by. Try Googling for hydroponics in your town.
There are so many sites, each offer better deals than the other. If I were you I'd get a tent, fan, Ph meter, Nutes, Ph solution, cloner gel, rock wool and a good HPS light but first you should decide if you want to do soil(<-slow) or hydro! I'd say spend $500 but you can get away with as little as $150 for a grow that produces a somewhat decent yield.