Most N64 games on Amazon have zero "new" copies available for sale. Like Super Smash Bros for example, all used at it should be: https://smile.amazon.com/Super-Smash-Bros-nintendo-64/dp/B00000J2W7

EDIT: And here's proof that the Amazon listing that's now offline had zero "new" copies available, it's a Google Cache link from this morning: https://webcache.googleusercontent.com/search?q=cache:kiURtnpLcrYJ:https://www.amazon.com/Pokemon-Snap-nintendo-64/dp/B000031KJM&cd=1&hl=en&ct=clnk&gl=us

Did you read the whole post? They removed the whole Amazon product listing, nothing to do with an individual seller! This is not eBay where each seller has their own listing. Now no one can sell Pokemon Snap on Amazon anymore, used or new.

I wasn't even selling the game, I haven't even had an active selling account on Amazon in six years. It must have still been in my inventory though (a single used, authentic personal copy) and I'm guessing all sellers who had the game in their inventory/for sale got the same message.

They have plenty of N64 game listings on Amazon where only used copies are available. See Super Smash Bros for example. https://smile.amazon.com/Super-Smash-Bros-nintendo-64/dp/B00000J2W7