Does anyone have up-to-date information on how to purchase a copy of Dr. Thomas Weggemann's The Speaking Stones of Siret?

I find it described at a kehilalinks site, https://kehilalinks.jewishgen.org/bukovina/speaking_stones.htm , and also at Dr. Weggemann's website, http://www.dr.weggemann.at/siret.htm ,  but the email addresses at both locations -- and for his American agents -- come back return to sender.

Thanks in advance for anyone who can help.
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Joe Kraus
krausj2@...