As far as I know the only place to get a 1 day pass is at the gates. According to the Disneyland site a 1 day, 1 park ticket (adult) is $59, and a park-hopper is $79. It looks as though you might be able to pre-order a 1 day park hopper from the Disneyland site though.
None of the Canadian travel agencies will have 1 day tickets for sale - we're not "allowed" to (or more correctly they don't want us to). The only tickets that are made available for Canadian agencies start at the 3 day park hopper tickets.
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