I buy mine at Menards, you don't have those in SoCal. The bag I buy is labeled "Cypress Mulch" I bet they have something similar but don't recognize the title I would check for myself if I was you. However I wouldn't be suprised if you have none at all the west coast stores often sell redwood bark or mulch because thats what they have close by.
If you can't find it you might check with local tree trimmers, the kind that chip the trees on site. You might be able to get some tree mulch for free, I did that long ago in the LA area. It saved them the cost of transport and landfill fees. Just make sure you know what type of tree it is.
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Jeremy
"I am become death, the destroyer of worlds" July 16, 1945 Robert Oppenheimer
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