Mind if I add a couple tips for the broke stoner? Didnt think so.
Look on craigslist.org, go to your area and look in the farm+garden section, I often see grow lights for sale on there for a good price.
Electrical suppliers/ wholesalers in the yellow pages usually carry MH and HPS lighting systems for way cheaper than hydro shops.
Building your own lighting system may be the way to go to save a buck, but only do so if you feel confident that you can build one without shocking your self or burning your house down.

Good job Khronic, did you write all this off the top of yourhead, or plagarise it? Either way this is good info and belongs in the FAQ's.