Well, I have never used an online pharmacy, I guess they wouldn't exist if they weren't legal, although I do always hear about them being shut down. But, the other part of your question would be illegal. Also, since you already see a PM doctor, getting them online wouldn't exactly be honest. Most people have had to sign a contract with their pain management doctor to only obtain your pain medications through them.
Trust me, I am sure we have all been in a desperate place and while it may make you want to go another route to obtain medicine, it just is not worth it. Once your doctor has found what works for you, I am sure you will be glad you stuck it out. If your PM doctor ever found out you went to an online pharmacy he/she would fire you as a patient and it would be in your record, making it almost impossible to find another doctor. Just be honest with your pain doctor and keep your pain diary.
cervical fusion 2006, with great result
L4-5 surgery with cages, plates, and screws in 2005, I have continued pain
MEDS: Fentanyl patch, Norco, Celexa, and trazodone
Im going to smile like nothing is wrong, act like everything is perfect, and pretend its not hurting me. (quote used with permission from "Tennis").