Birth, marriage and death records are the responsibilty of each individual province and also subject to privacy laws. There is no central index. The info contained on them varies by province. Each province has a vital statistics website that can be used to order a cert. Price varies by province also.
Depending on the province some records are actually on line through ancestry or familysearch, subject to the aforesaid privacy laws. Some provinces, eg. New Brunswick, have their own vital stats website images available for free.
This link will give you an idea of what would be available to get from the province of Manitoba….
https://vitalstats.gov.mb.ca/Query.phpAdded: it is my understanding that a marriage index is not yet available for the province of Saskatchewan. So your success is really going to depend on the province you are looking at.
PB