A few of the dvd and bluray cover sites will likely have the official covers - and few similar custom-made ones too š
Sites like http://www.customaniacs.org/forum/ & http://www.hirescovers.net/forum/index.php & http://r1db.com/covers/ & http://forum.blu-ray.com/showthread.php?t=100007 & https://www.freedvdcover.com/blu-ray-dvd/ etc
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The 2 main threads on here to feature covers are:-
the dvd covers thread - http://originaltrilogy.com/topic/Star-Wars-DVD-Covers/id/741/page/181
Blu-Ray and other HD box size STAR WARS covers - http://originaltrilogy.com/topic/Blu-Ray-and-other-HD-box-size-STAR-WARS-covers/id/11843
though there are many more great threads to feature some quality covers on here too - itās really a question of sifting through the various threads to find what you likeā¦
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It may also be worth typing into google images and other search engines āstar wars custom blu ray coversā for some similar or slightly amended covers too.
Good luck with it š