According to live reportage at a US boutique which stocks jewelry and fragrances from Les Néréides, "créateurs de bijoux haute fantasie", (and what's more, who buy their stock directly from the company as well), several fragrances in the line are getting discontinued. The reasons might have to do with low turnover as well as impending restrictions that would necessitate too much hassle to reformulate; it doesn't really matter. What matters is that the niche sector is regularly weeding out fragrances as well, as evidenced on these pages before.
The rest are definitely going the way of the dodo! If you are intent on some of them, stock up now or take a walk at your local TJMaxx/TKMaxx where some might surface eventually.
thanks to poppypatchouli/POL for drawing my attention to it