I would say buy with caution. The site you mention could well be an American site disguised as a European site. It wouldn't surprise me.
The KIX brand is one I've had the pleasure of using. A trick of mine brought some back from a trip to Amsterdam and they were great, but so are many of the brands available here in the U.S.
I will admit that I wasn't checking the KIX label when tricking to see if it was NitrIte or NitrAte, but armed with the information you have from ScruffyCub, you will notice that the KIX available on poppersbrands.org is Amyl NitrIte not Amyl NitrAte. Their claim on the site is that these are original formula poppers, but you are now an informed consumer and you know better.
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