I read on Mousesavers that there's one right now, for travel from August to December - pay for 3 nights and get the 4th free at any of the 3 DL resorts...
Disneyland does not offer codes like WDW does. If there is a special deal, it is available via disneyland.com, any travel agent, and usually travelocity and expedia offer it as well.
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