As Bud says some of the older ones are no longer mass produced so hard to find. Even some I bought a few years ago which were everywhere when I bought, I've found hard to replace a few years later.
Just one note, is that if you are looking at buying from anywhere outside Europe then you needs CITES an possibly other import paperwork. Less than scrupulous suppliers sometimes don't tell you this. If you are buying from the European Union then you don't need to worry about this.
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