At this point, I would like to pass on a tip. Since our previous supplier for zinc anodes has a very ambitious price idea, I looked around the Internet and stumbled over BoatZincs.com.
In order the purchase pays off in terms of shipping costs, I ordered three anodes; unit price $14.23, plus shipping (International Mail) of $32.95, a total of $75.64. DHL delivered the package and charged 12.23€ for customs. The fun cost €76.61 or €25.54 per anode, less than half the manufacturer’s price. The service of BoatZincs is perfect, anodes ordered, a week later I had them on my desk. Wonderful!