it has to do witht the growers costs. if its indoors he has to pay for soil, lights, water, heat, and all the other bullshit. also if he can get 40 for an 1/8 then he will. it all has to do with what people are willing to pay. if noone in your area will buy it for 40 an 1/8 then prices will go down. but thats not likely. its all about costs and competition. the reason it was cheeper 30 years ago was because everything else was cheeper.