I wouldn't dabble in them if I were you. They have really bad physical effects as well. RCs are sort of easier to get and cheaper too. Hella cheaper. DW serves them up SUPER cheap but after Hansa sunk, the only market left open is Dream.
I wouldn't use Dream though, tbh. I don't know where you get your stuff, but be weary of DW in general. Hansa seemed like such a lovely place till Dutch LE stepped in.