Greetings everyone.  I am trying O2 at last, after several failed attempts to get the docs to prescribe the right flow rates, etc.  The mask I was given is a rebreather, but does not seem to have a true fit.  I read about clusterx on this forum, but the clusterx.com website is no longer active.  Does anyone know where I can get the clusterx mask, or have another recommendation?  I want to try this for a while using a rebreather before going to a demand system.  Thanks in advance.  P.S. It is definite: Par Pharm has released generic imitrex subcut. to the trade, and it will be in drugstores very soon.  Probably the price will not be that much better for a while, but eventually, it should come down.