I contacted the Dutch office of the manufaturer. Strangly enough they could not inform me about Buckley's and why it is not available in the Netherlands.

Did some websearching and found out the product contains something hazardous to animals (!?!) Other than that I can't find any reason why it isn't around anymore (other than the horrible taste laugh )

I will contact the autorities and try to find out if there are legal issues regarding shipping the stuff into the country.