While production has ceased, you may occasionally find "dusty" or expired stock at specialized liquor stores, though this is rare as the beer was a seasonal winter release from several years ago.
Since the Gingerbread Spiced Ale is unavailable, you might consider Blue Moon's current or other past seasonal winter offerings: where to buy blue moon gingerbread spiced ale
: A popular winter seasonal with ginger and orange peel. While production has ceased, you may occasionally find
: A limited winter release featuring cinnamon and caramel malts. Gingerbread Beer Substitutes While production has ceased
If you are specifically looking for that gingerbread flavor profile (ginger, molasses, and cinnamon), other breweries often release similar seasonal ales: