These seem to be dropping in price. This vendor is selling the carbine with the muzzle brake for $770 shipped ...
http://peakfirearms.com/index.php/firearms/cz-usa-scorpion-evo-3-s1-carbine-9mm-08505-1263.html
http://peakfirearms.com/index.php/firearms/cz-usa-scorpion-evo-3-s1-carbine-9mm-08505-1263.html