That would be a good idea. I've used "City Pass" in Chicago before and you essentially pay one price for up to 5 attractions. I think it's two set attractions and then you can choose 3 more from a list of 10 or so.
There's also NARM. When you buy a membership to, say, OKMOA, you have member access to a whole network of museums across North America. The five in the metro are OKCMOA, OCAC, the Western Heritage Museum, Edmond Historical Society, and Fred Jones Museum of Art.
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