Yeah, it's not fucking cheap. I used to spend a lot of money on decks. The really shitty part about it is that they don't even last all that long; Get a deck wet and it's probably done, fuck up on a rail with a light board and you might snap it. You could keep one going for years, but being a teenager you're probably going to fuck it up sooner than later. Trucks and wheels could last you a long time if you made a good initial investment though.
Sadly, last time I was on a board I couldn't even oly. Weird how you can actually lose that shit.