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Bladetech, Comp-tac or Safariland all have suitable holsters. My current favourite is the Safariland 567 holster series. Depending on the specific model it can be adjusted to fit several different guns. There are plenty of dealer links up top who can help you although I don't think there are any Comp-tac dealers in Canada.
Note that the IDPA rules are in review and also that your Shadow may require very specific modifications to be considered IDPA legal. There are plenty of posts online about this, I suggest a search if you are unaware of this issue.
Thanks for the holster advice. I am aware that stock its currently 3oz overweight (Have confirmed this with my paticular model) and the modification needed to get it under wieght pending any reviews. I am going to wait till the new manual comes out.
EDIT: Will the shadow fit in to standard CZ 75 holsters?
Are you talking about the 75 Shadow or the SP-01 Shadow. I assume it is the SP-01 Shadow. The 75 Shadow doesn't have a FLDC and makes weight for SSP Division.