Many DZs have "block prices" where if you buy more tickets at once, your cost / ticket is lower.
But it would help if you tell us where in California you are, because if you're living in San Diego, cheap tickets in Northern California probably won't help you that much (on average, Northern CA DZs tend to be cheaper than Southern CA DZs).
I just did some $15 jumps at Lodi this past weekend when I was up there visiting emmiwy. For a couple people that have quite a few jumps and know what they want to do, it's a great place, and they were turning loads well for a Friday. I don't know how the load organizing or coaching works for someone with less experience, but everyone I talked to was nice enough.