Weapons and firearms such as rocket launchers and AK-47s are available for purchase on the black market in Europe for prices between $400 to $930 (300 to 700 Euros), according to Europol.
(Prices of AK-47 and other weapons on the black market.)
Source: Stephen Fidler, “Going Cheap in the EU: AK-47s,” Wall Street Journal, Real Time Brussels Blog, July 15, 2010.