deccabell - If you wait for the phone to ring, you might prematurely end your son's baseball career.
California is unique. It is the baseball talent center/capital of the world. As infielddad once posted, if a guy like Evan Longoria can go unnoticed out there, anyone can.
Look, we have members here that are top-downers. Not even sure why/if they need the advice offered here because they are being courted by the likes of UCLA, Cal State Fullerton, Stanford, or other west coast powerhouses. These types start at the top and work their way down.
I believe if you are not one of those (like the majority of decent high school prospects imho), a better strategy is to work it from the other direction. California has perhaps the nation's finest and most competitive JUCO system. Contact every one of them within a reasonable distance of your home ASAP and see if you can get a tryout or attend a camp/showcase they will be attending. Contact every college that ever sent correspondance and see if they are still interested. Contact every college you think might have interest. Contact all these and more. Each time you speak to a coach, ask them if they are aware of any opportunities at your son's position at other colleges they are aware of (assuming they don't currently have a need at your son's position). In this manner, you will be building a baseball network that will lead to opportunites.
California does not really have a thriving D3 presence but they have some fine D2 colleges that you ought to contact. Consider out of state opportunites (D1, D2, D3, JUCO, NAIA) if it is within your budget. There are tons of colleges all over the US that would love to have a California kid (with decent talent) on their roster.
Recruiting is actually a simple equation. It is talent plus exposure. Missing either piece will end your son's baseball career. If all your son has been doing the past couple of years is showcasing in front of the likes of Cal State Fullerton et al, and they aren't making offers, then the exposure strategy has to be adjusted to your son's talent level. The college marketplace will let you know what that is by the type of feedback you are getting.
The talent side of the recruiting ledger is actually less than many here assume. It takes decent talent to play college ball imho - not overwhelming talent. What it really takes is decent talent and OVERWHELMING desire. Does your son have this type of desire? Do you? Waiting for the phone to ring does not demonstrate any type of desire to anyone. You and your son have the power to make this whole thing happen - perfectly. Now get busy and make it happen.