Discounts are a lot harder to come by at DL Hotels (unlike WDW). You may be able to get a discount with DC or
AAA.
However, according to
Dreams Unlimited (I booked 3 nights at GC, Resort Magic Package w/ DC discount),
Disneyland Resorts only discount packages (10% off room portion), but not room only. I got quotes from DU for room only and with a package, and in this case (also unlike WDW), it was worth it for me to go with a package (only about $100, and it included 2 hoppers for adults, breakfast, and some other things. A 3-day pass alone is about $116).
I got quotes from DU (no obligation to get a quote) and I did the calculator thing on the official
www.disneyland.com site, and DU cost less, plus they got me the DC discount on the first try. If you want to call-in reservations directly to DL, check the official site, they probably have the number there.
So, a long answer to a simple question!!!