To the point to be annoying. I am running an open database of chemical properties[0], I get nearly every single day Chinese companies proposing me to buy whatever compounds they are producing including non legal ones.
Even more stupid, I get phone calls and email asking me if I can source stupidly well known illegal drug for a friend doing some research. Even if this is clear that I am just providing experimental data and no chemicals at all.
So yes, you can get chemicals very easily and you have a lot of providers which are not really looking at the legality of the stuff.