There is no shortage of bikes. There are different bikes being sold every day and new ones be added. If one gets sold, move on to the next.
Exactly.
Here's a business lesson for you (tacobell) that I just noticed. When buying something, don't let the seller know that you're really interested in the product. I look and I see that your tagline is "wants the SX trail". As soon as an intelligent seller sees that, they're going to be a lot less likely to deal on the price because they know that you really want it and you'll more than likely pay the extra couple bills to get one. Just a little piece of information for the future.
There are so many people that ride in Cali that buying used shouldn't be a problem. If you are very worried, see if you can get your parents to front you the money and you work it off via doing chores or whatever else you do instead of getting an allowance.