I'm sure you could get anywhere from $15 (inexpensive) to $60 or more each, providing that you are willing to commit a felony crime carrying a mandatory 20 years in prison if you are caught. 30 years if the drug causes "injury or death," after it leaves your hands (
United States Department of Justice USC Title 21 Section 841) Federal jurisdiction could be a real possibility
concerning sale of schedule II drugs can be handled by the DOJ in your state as well as by the DEA. So there's that drawback.
I'm more inclined to ask if you have been taking 80 mg. 2x daily (and not crushing or snorting to evade the slow release coating) if you have any idea how your body will react to the sudden, total withdrawl of a narcotic in the same ballpark as Demerol and morphine. Are you in excellent health? Even if you are you won't be about 18 - 24 hours after your last dosage. Go watch the movie The French Connection where Gene Hackman goes through what you will be going through. I strongly suggest getting on the local chain pharmacy medical support program to remove the cost issue, telling your doctor you want to taper off the drug with your goal being a non-narcotic management of your back injury. Explain your financial concerns (I hope he isn't just handing you three scripts at a time for 80mg OC #60 and saying "see you in a few months." either way if you want to end up in the ER convulsing, sweating, dry heaving, cold yet hot, unintelligable and with a pulse count of 180 wishing you had a gun so you could make it stop - well, it's your choice.
I've seen this happen, and it is avoidable, and advisable to think serious about what Ive mentioned.
Try this: take your next dose today, then give your wife or friend all of the rest of your current bottle and tell them to hide it and not give you any for 48 to 72 hours. See how you feel.
Oh don't sell them within 1000 feet of a school, etc. It doubles your sentence where I live. If you get caught. And if you sell them to someone with no tolerance they could easily do something like eat 3 and have a few drinks and die.
Be careful, but do what you have to do.