Historical Disneyland Resort Hotel Discounts?

[nerdboyrockstar]

Mousesavers.com has this for WDW but I was wondering if there's a place that you can see what the discounts for DLR hotels usually are, when they come out, for what dates of booking, etc.

I'm planning a trip for December so I was wondering AP rates, when the Expedia deal usually starts, etc.

I know it can change but just to get an idea.