Nice to see you on this message board! I'm afraid I can't be of help re: availability of Citrucel or Benefiber here in Canada. In fact, you are way ahead of me in trying Acacia. I'm waiting to hear how you are doing on it and, depending on the report, I may try it too.
In the meantime, I'm still too chicken to try a fiber supplement. Can't you see my feathers?!!!