Several years ago, I did quite well in Budapest: they  have a slew of antique shops near Kalman Imre  street . There were nice old Hungarian swords, tons of yataghans, kilijes etc. 
 The prices were ~ half of the then-prevailing e-bay  prices and many sellers had no idea what they were talking about ( every buyer's dream!).
 It must have changed since.....
 Detroit Gun and Knife shows used to be good, but going to Detroit is like roaming around  Waziristan  and waving  Stars and Stripes