Pretzel (Level 4)
How much would be a normal price...
Be for a N64 test cart??? On the digitpress rarity guide, it says Test Cart R0, but I can't find them anywhere.
Great Puma (Level 12)
I would imagine it is hard to price that type of stuff. This may not be what you want to hear but it is worth whatever you or somebody else is willing to pay for it. Sorry for the cheesy answer.
I've seen them go between $200 and $400 on ebay, maybe even a little less than $200. I think it is rarer than the NES and SNES test carts, probably because the N64 doesn't have nearly as many problems. I think the $400 one was a fluke, and $200 is solid average price.