Check local shops for used completes, craigslist usually has something, and eBay May but do your research. Comet has some really cheap decks and they're great for beginners or those transitioning from street to longboarding.
@Ghostoftheswift@crazyheart well I'm 18 and live with my parents so @steezus I can just use there car but if I was added to my parents insurance it would be jacked up another 500 a month. Which is insane. I need to get my own plan started, but first things first. I need a job. It'd be cool if I had a good board to ride. I highly doubt the one I have could be considered "reliable transportation".