Mexrxonline.com offers oxycontin but it's very expensive.

"On a side note, there is a new formulation that just got patented that will include an opiate antagonist in the mix, that is encapsulated in an insoluble matrix, so if the pill is not crushed, the antagonist will not be released, and the XR version of the medication will work as normal.

If the pill is crushed, the antagonis is exposed to the GI tract, and will counteract the effects of the opiate medication, making current trends of abuse useless, that is, until someone chemhacks it and figures out how to bypass this measure."

I was wondering what exactly they had done to make this happen. I had heard they were experimenting with methods of neutralizing the effects of crushing meds while allowing their effieciecy if uncrushed. Found this hard to believe but your explanation seems plausible. The only thing I wonder about is with the formulation you described, you cannot guarentee the antagonist won't totally NOT be involved in the digestive process if pill is left uncrushed. There is no way to guarentee that.