I'm not too familiar with non-NTSC prices for things.  I know it isn't Nintendo, but maybe you guys can still give me some hints/help.  These are for collecting purposes:

Eliminate Down COMPLETE (Japanese) - $280
GleyLancer COMPLETE (Japanese) - $140
Koutetsu Teikoku: Steel Empire COMPLETE (Japanese, English Manual Included) - $75
PulseMan COMPLETE (Japanese) - $75
BattleMania COMPLETE (Japanese) - $70
Koutetsu Teikoku: Steel Empire COMPLETE (Japanese) - $70
KU-U-GA Vapor Trail COMPLETE (Japanese, English Manual Included) - $45
McDonald's Treasure Land Adventure COMPLETE (Japanese) - $45
Crying Bio-Hazard Battle COMPLETE (Japanese, English Manual Included) - $40
Gynoug Wings of Wor COMPLETE (Japanese, English Manual Included) - $37
Golden Axe III 3 COMPLETE (Japanese) - $35
Jurassic Park COMPLETE (Japanese, English Manual Included) - $30
Cool Spot COMPLETE (Japanese, English Manual Included) - $25
James Pond II: Codename RoboCod 2 COMPLETE (Japanese, English Manual Included) - $25
Disney's Aladdin COMPLETE (Japanese, English Manual Included) - $23
Dynamite Duke COMPLETE (Japanese, English Manual Included) - $20
Thunder Force II COMPLETE (Japanese, English Manual Included) - $20
Golden Axe II 2 COMPLETE (Japanese, English Manual Included) - $18
ESWAT: City Under Siege COMPLETE (Japanese, English Manual Included) - $17
Fatal Fury 2 II COMPLETE (Japanese, English Manual Included) - $17
Ecco the Dolphin II 2 COMPLETE (Japanese, English Manual Included) - $15
Ecco the Dolphin COMPLETE (Japanese, English Manual Included) - $15
DJ Boy COMPLETE (Japanese, English Manual Included) - $15
Galaxy Force II 2 COMPLETE (Japanese, English Manual Included) - $11
Fatal Fury COMPLETE (Japanese) - $11

Subterrania COMPLETE (European, English Manual Included) - $25