20's go for 5 or 6 'round here. I've heard of people paying a berry a milligram. That's just short of insane, though. It's been over prescribed recently and readily available so $0.25/mg seems good, but honestly I don't think that shit is all that great.
BTW, If you are asking because you want to sell them, you should be careful. I don't know if it's just around here or everywhere, but there is new legislation that made selling these an offense equal to selling heroin. Thats trouble no one needs.