When someone snatches it it will show it as available on istock for a little while but then istock updates and it shows it as gone. And if you try to add it to your cart again, apple will show it as unavailable.Doesn't that usually mean someone snatched it?
These devices have been showing on istock as available for hours and apple shows them as available then when I check out they aren't. Clear cookies start again and the same thing - apple site always show them as available as does istock.