If you want official then Samsung is gonna be the only one that makes it. If Samsung makes it then there may be a possibility that a retailer may have some of them for sale. To see if an "official" one is even made, check Samsung.
I know there are several 3rd party flip cases that are made because I was just on Ebay and saw them. Also keep in mind that just because it's made by Samsung, it's better. There are some 3rd party manufacturers out there who make equipment that is well made.
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Samsung Galaxy Prevail
TF300T Asus Transformer 32GB w/ dock
Samsung Galaxy S3
IS THERE A REASON YOU'RE NOT ROOTED YET?