As has been mentioned, it appears to be nowhere near as rare as was once thought (I remember when the retro scene really started to kick off about ten years ago, magazines like Edge Retro going on about its rarity). I picked my copy up for a couple of bucks in Value Village of all places. Excluding shipping I'd imagine you paid $25-$30 for it? If that's the case it sounds like a reasonably fair price to me.