I have seen a CIB Robotrek go for $75 so I believe a sealed one is worth $150+ because the box & manual are pretty rare. Gradius III sealed is not worth very much though.
Gradius 3 I sold one for around $75 but that was much higher than usual. Probably $40 or so in the past
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WTB Cdn sealed black boxes, sealed Cdn first party titles. I.e. the "mattel" Cdn boxes with both french and english. Mainly black boxes, zelda, link, and tyson, but let me know what you have. I am interested in anything I don't already have!
Bronty: wow If you could sell me a sealed Robotrek for $85 then I will walk away knowing that I can resell it for double. Listing # 250163607445 went for $74 CIB and that was the first complete one in the last 2-3 months. But I agree that this game has probably peaked with the last sale and will lose some value next time.