Does anyone know of a source for the original Larraburu starter?

Thank you all for the excellent articles and posts on Larraburu french bread. As a former Bay Area native I grew up with Larraburu bread and loved it. I make my own bread and starter. Does anyone know of a source for the original Larraburu starter. One of the bloggers described a cold storage area where they had it stored.  I would be very interested to get a sample if it is available.

Thanks,

Michael