This was a Limited Edition release. Limited Editions are rare or unique beads which are only released in very small quantities, and which are only available in stores until sold out.
Trollstones are so rare that only trolls know where to find them. And if they find one, they keep it safe for the rest of their life.
Please note: Each glass bead is handmade over a red-hot open flame and no two glass beads are ever completely alike. This goes for size, coloration and pattern. Your bead may have slight variations from the bead pictured.