The Canadian Firearms Centre, CFC, does have records of costs for the opt-in provinces of Ontario, Quebec, New Brunswick, Nova Scotia and Prince Edward Island as has been reported publicly. The CFC does not monitor other potential or actual costs that may have been incurred by provincial or territorial agencies in enforcing the Canadian firearms legislation. The CFC does not monitor the costs that may have been incurred by firearms owners, firearms clubs, et cetera, as a result of the Canadian firearms legislation.
In the House of Commons on May 26th, 2003. See this statement in context.