Basic search, all of Canada:
The Library of Parliament produces excellent briefing documents on timely topics.
In addition to the digitized documents available through the Government of Canada Publications (DSP) catalogue, here are some other sources:
Some government information may not be made readily-available to the public, but can be requested under the terms of the Access to Infromation Act. Secret Canada's Guide to FOI (created by the Globe & Mail newspaper) provides lots of helpful tips and templates for filing ATI requests.
You might want to start by checking some of the databases listed below to see if someone else has already requested the info.