Is it from a novel? I think it may be something like purchasing agent, and it's a way to smuggle drugs by substitution. I think ur post is interesting😊

An infomercial is a tv commercial that shows how a product works. Typically these are late at night and considered low-status compared to most tv programs. A guru means expert, this word originated in India, though unsure which of their many languages. It’s a strange phrase but sounds like someone famous for selling stuff on television