What did a Kettenkrad cost new?

What the Wehrmacht paid for a Kettenkrad, I don't know.

I know exactly, what a Kettenkrad has cost in 1947:

RM 6,810.-

To compare: A Mercedes-Benz 170V sedan has cost RM 6,200.- at that time. Prices in Reichsmark (RM), the Deutsche Mark (DM) came later in June 1948.