I assume by NTSC, you mean USA. Don't forget that Japan is NTSC, too. I doubt you'll find one here for that. Two copies sold yesterday for just over $90 each. It usually sells for around $100-150. However, a copy did sell Buy it Now for $80 not long ago and there is this copy with no bids so far. eBay is going to be your best bet - you're unlikely to find a game that sells for upwards of $100 for $80 on a collectors' forum.