30mg perc? The percs with 512 on them are 5mg, ok maybe you are asking how much 30mg is worth. Well, the 10mgs can go for $5, so $2-$2.50 for the 5's. So about $15 for 30mg
It completely depends on where you live. In kennesaw we where getting oxycontin (i don't know what mg) for around 5$ a pop, which is INSANE. But then in the local paper they had a report about a kid who was arrested (a pharmacist's assistant) who had just been stealing them. Now you can't get them for less than 20.