There are many little hotels and hotel chains around Disneyland at rates much more reasonable then Disneyland Hotels.
If you're looking for affordable hotels around Disneyland, I would venture out around 3-5 miles away from the park to get a decent price for a hotel.
Try the Stanford. Reasonable rates and the ART shuttle stops right in front of it. We chose the Cortona Inn this year and wish we hadn't.
Village inn is close and reasonably priced. The room is smaller than normal, but still comfy
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