With all due respect.
I would bet that the illegal pricing and distribution networks are willing to beat the price and have more convenient sales points than the state-sponsored dealers.
I don't know that for sure, yet, but the illegal markets have been remarkably resilient.
Why not just do without? Would solve the problem. And it's not as if it's necessary, not like food or water. And people would be much safer drivers. As it is, a pot-addled person is not a good driver. Or parent. Or employee.