We don't seem to have that many in the uk. The only classic style Dahon listed on ebay currently is this one.
Dahon Folding Bicycle
It seems to be a later budget version with a low end chainset and doesn't look half as nice as the California.
I'm looking myself for a classic Dahon so I guess there is some demand and wonder if prices and availability are much better in mainland Europe. I don't need stainless steel but I also don't want one of the low end versions either.