n64s are a weird thing. I myself been looking at eBay for a replacement and yet to find one I am happy with since I own around 70games already lol.
sometimes they go real cheap (as in $50 for second hand console alone) and sometimes they go crazy.
what really makes the difference is
the game titles and if they are boxed come with manuals.
how many controllers and if the thumbstick is still good.