I didn't find any. Only once on Ebay but the seller disappeared. Someone here told me to watch daily as he could come back as it appears he does it sometimes.
Anyway, SN alone it likely to fail if I reffer to what I can read here, and the other drugs requiered to CTB with SN are likely to be unavailable in EU too, at least if not prescribed by your doctor.
If you got some tips while researching, I'm interested.