BLAH Eliana! I'm having the same problem and it's SOOO frustrating!!! Ugh. Walgreens stopped being able to get it for me months ago (maybe almost a year?). Then I was able to find it at my hospital pharmacy. They supplied me for a few months and now they can no longer get it either. I was told the same thing you were when I checked with CF Services, and that they don't have any idea when they'll get more in.
I've had a pretty nasty exacerbation recently and am coming off of 4 weeks of IVs. I'm still not back up to baseline and I REALLY need my mucomyst. I'm beyond frustrated.
Anyway, the FDA's website says the next release is scheduled in March, but that is only by 1 of the 3 manufactures. The other 2 manufacturers are no longer even giving an estimated release date, which is definitely not good news. So the little that is released in March will probably go to hospitals and we won't see any of it!
Here is the link. I've been keeping an eye on it for updates, so it may be helpful to you:
http://www.fda.gov/Drugs/DrugSafety/DrugShortages/ucm314739.htm#acetylcysteine
There are only a few of us that I know of around here that still use mucomyst. Hopefully some others see and respond. I'm sorry I can't be of any help regarding online and/or Canadian pharmacies. I know it would make me a little nervous, but I can DEFINITELY see how you would be desperate enough to consider it. Let me know if you decide to go that route, would you?
Autumn, 32 w/CF