i know Astellas pharma sells NAC as a prescription in contental Europe (namely Austria and Europe).
Have you ever asked your doc for an Rx?
If worse comes to worse, you can get a prescription of Mucomyst (NAC for nebulization)and drink it. I'm not sure it works as well as fizzy NAC, but I know some CFer's do that here in the States.
let me know if i can help you with anything else <img src="i/expressions/face-icon-small-smile.gif" border="0">