The molds for Gottstein's "Battle of Murten," (54 molds for 70 figures) are in the collections of the Swiss National Museum in Zurich. The museum acquired the molds in 2010. At the same time, the museum also acquired Eugen Blum's 103 molds for 210 figures and Curt Kohlbrunner's 7 molds for 12 figures relating to the Battle of Murten.
I attach the museum's magazine from 2010-2011 where they discuss the acquisition of the molds on page 80.
As far as I know, the museum is not selling casts of any of the figures.