I strongly suggest you look into custom fit musicians earplugs. You can get them for about $150, and they are the best investment I have made. They don't sound exactly the same as no earplugs, but they are darn close, and will save your hearing.
Before anyone says that $150 is too much, think about how much money you invest into tubes, strings, etc to get the tone that you want. Now think about how much it will suck to have your ears ring for the rest of your life. Those earplugs shouldn't seem so expensive now.
You can get them with 9, 15, and 25 dB filters (I suggest going with the 15dB), and since they are custom fit, they don't hurt your ears to wear them. I have small ear canals, and the one size fits all musicians earplugs always hurt to wear. Now I don't have to worry about it. I wear them at every show I go to, and my ears don't ring afterwards anymore.
You should be able to get them at an audiologist, and if you can't find one in your area, go to someplace where they do hearing aids - they should be able to get the molds done for you.
Protecting your hearing is one of the smartest things you can do as a musician, and in the long run, custom earplugs are not a lot of money.