According to the knifecenter, the plain-edged Civilian is discontinued. Then again, I've been hearing different rumors of the Civilian being discontinued in one way or another for two years now, but they still seem to be making them.
Friends of mine have owned two of them in plain edge, and they're very attractive, but I prefer the serrations for the intended use of this knife. At any rate, I think it's fair to guess that only aluminum-handled Civilians were made in plain edge, and that these were a very small minority of the overall number made.
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-Corduroy
(Why else would a bear want a pocket?)