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I'd look on Google Maps in your area and simply type in 'Lumber' and a few pins should drop. There's usually an 84 Lumber company around most big cities. If cedar is out of stock, Redwood, Cypress, Douglas Fir are all pretty good outdoor woods.
Red or white oak would be good for this. I'd elevate the base a little bit so wood isn't directly on the concrete. Water over time will soak up through the end grain and turn the wood black over time. I'd certainly still seal the ends to keep water from getting in the wood.
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