Where to find Swiss marmite - cenovis?

I love marmite, but recently read that there is also a Swiss version called cenovis that originates very locally in Rheinfelden, perhaps not surprising as being a by product of beer production. Does anyone can suggest where it can be purchased? is it very similar to marmite??

There seems to be also a german version called vitam-r. I'd be happy to sample it too, if only i can locate it.. preferably not far from Basel :)