You can find the egg on Amazon and Etsy. The only difference is that on Amazon a black egg turns pink and a purple egg turns blue. If you don't even want that much of a hint, the Etsy eggs start black for either gender.
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How do you find out if it was a prince or princess that was promised? Heat it up! The eggs are metal with color changing paint.
What else do you need for the perfect "Game of Thrones" gender reveal? A "Baby is Coming" banner is sure to let all of Westeros know about your little arrival.
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You can even get "Game of Thrones" themed cookies from The Cookie Pirate in Houston.