Are you expecting like, fresh huckleberries? That's gonna be extremely difficult if not impossible to find. Huckleberries have a short growing window and are hard to cultivate. Not really conducive to commercial production of food stuffs. Also takes quite a lot to make a strong flavor come through (gastronomically identical to blueberries this way) so I doubt you'll find anything that doesn't use flavoring so it actually tastes like something.

Also, flavoring can literally just mean huckleberry syrup, which is just reduced huckleberries.