In California you can purchase, posses and
grow cannabis if you have a prescription.
There individuals and CoOps that are allowed to
grow and sell to dispensaries here.
Put all the other growers into the mix and I see no shortage of weed in this state.
I am not sure why one would think that a state that has dispensaries would have less weed.
Maybe I misunderstood the original question, or maybe I am just stoned.
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There is a link below from NORML that allows you to easily E-Mail your government representatives regarding cannabis issues in your state. Change happens when your voice is heard, and it only takes a couple of minutes.
Contact Officials - NORML