Thanks again, got it at another Spolem! 84 gr, not even a zl!
Glad you've found it! Now that you know what to look for, you should be able to spot it in most shops :)
BTW, have you ever tried to make rye bread, or sourdough bread of any type? Takes a little time to develop your own sourdough, but it makes great bread too and it keeps longer than the yeast-grown kind.
Here's my favourite recipe site (there's a translation button - not perfect, but intelligible):