I've been looking here in SoCal myself. Nothin... So I had one of the workers look it up in their computer inventory. They did'nt have a record of ever having it in stock. They never heard of it and said it might not be available on the west coast! Weird! Hopefully someone can offer better news. Sad but I've come NOT to trust store employes. I've gotton misinformation one time to many!
southdown was generally sold only in midwestern and eastern HD's but not on the west coast.
though, you may find some reefers that have some.
you could also ask them to search other HD's for it, if they find one with a full pallet they can have it shipped to thier store. however, i just tried that a few weeks ago, and they couldnt locate a single store in the country that hada full pallet.