There are no stationary shops, of course, but you can order it from your country, so it doesn't go through customs clearance on way to your home.
Idk if there are labolatories here, or they just import it.
There were stationary designer drugs shops few years ago, though. But they closed all of them when people started ending up in hospitals and it gained popularity in junior schools
These weren't clean substances, everything mixed as you say.