Wow that is a HELL of an answer MM. But there is a far easier explanation..... First the most common Morphine available is time released such as MS CONTIN. (morphine Sulfate) and it is SHIT. The high sucks.And FEW like it..though some do. I would love if a buyer would come in here and explain why? For certain pain it can be effective. It is Long lasting..18+ hours for 1 pill. And the other reason...and I believe the most important one...the same thing that makes other drugs such as Roxicodone $1+ per mg...Supply and demand!..There is plenty of supply...and little demand. Also on the retail level it is cheap. Less then $1 for 100mg. So the reason it is less money on here is demand is small.