That is exactly it. Amazon is not going to show stock that maybe is let's say in Idaho to someone in Florida because that logistics supply chain cost to get it to Florida is not profitable.
Can not find the post about how it wouldn't let a member add it to their cart. But I just saw it. So, a quick lesson about how Amazon website works, it is presently showing as currently unavailable. When that happens, there won't even be a price listed, so we that see currently unavailable will not even see price. Not only that, but, since it's showing currently unavailable, it also won't let you add it to the cart, since neither FBA that's Fulfilled By Amazon, usually the first option you see, nor a 3rd party seller of some sort, have none listed for sale, so you can't add it into the cart.