Hey, I've been out of the game for some time now, but N64 NFRs were something of a speciality for me, so I like to think I know a good bit about this area.
Back when I was still actively collecting 3 or 4 years back, before I took a temporary hiatus to get my financial situation in check, I remember being able to find these for around $600 to $650 in good condition on eBay. Nowadays I imagine the price for them has gone up, so I would say the $650 to $850 range is fairly accurate as far as how much these puppies are worth nowadays, but this is just my educated guess.
As far as rarity goes, assuming things haven't changed much in the last 3 to 4 years, I would say they're on the lower end of rare, or maybe mid-range rare at most. I would say they're probably more common than, say, the Donkey Kong 64 Grey NFR Or Yoshi's Story International NFR, but they're probably rarer than the Turok 2 NFR and Goldeneye 007 NFR, or perhaps on par rarity wise, price notwithstanding, since it's important to know that just because something is more expensive than something else doesn't mean it's rarer, and vice versa, especially with video game collecting.
Anyway, hopefully that gives you a better idea of the info on this thing. If you have any more questions feel free to PM me or reply here in the thread, this is one of the only areas of collecting that I feel comfortable talking about with some authority
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Former NES Sharp TV Owner