NavCanada is discontinuing production of World Aeronautical Charts for Canada.  They are also withdrawing the existing inventory, effective September 23, 2010. After September 23, 2010, WAC charts are no longer authorized for operational use.

Here's the text of NavCanada Aeronautical Information Circular 17/10, which contains the details. We've added links to the NavCanada site for convenience:

NAV CANADA will be discontinuing the production of World Aeronautical Charts (WACs) and withdrawing the
existing inventory from sale effective 23 September 2010, at which time these charts will no longer be
authorized for operational use. The decision to discontinue the production and sale of WACs follows the
completion of an aeronautical study in 2009.

WACs are the subject of limited demand and increasing production costs. Other aeronautical information
products are available that provide the detailed information needed to safely navigate Canadian airspace and
better meet flight planning requirements.

Visual flight rules (VFR) navigational charts (VNCs) with a scale of 1:500,000 provide full Canadian coverage
and include much more detailed topographical and aeronautical information than WACs with a scale of
1:1,000,000. For the complex airspace surrounding busy airports, VFR terminal area (VTA) charts, with a
scale of 1:250,000, provide the detail needed to fly VFR in these areas.

The WACs cease as an official aeronautical information product and customers must refer instead to VNCs
and VTA charts. A chart showing equivalent VNCs for each WAC is appended below (link to PDF copy of this chart here.) The price of a single VNC is $16.50, plus applicable taxes and shipping charges, and can be ordered by contacting the NAV CANADA AEROPUBS office or an authorized distributor.

Changes to the Canada Flight Supplement and the Canadian Forces Flight Supplement, Section B,
Aerodrome Reference, and Section C, Planning Section, VFR Chart Updating Data, to reflect the
discontinuance of WACs will be made over several publications cycles. The Canada Water Aerodrome
Supplement will be updated at its next publication.

If you have any questions, please contact the AEROPUBS office by phone at 1-866-731-PUBS (7827) or by
e-mail at This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

More info on NavCanada VFR Charts here.