They're carrying it at Costco now, too, though it's still about the same price as Brown Jug. And if you like Permafrost, the distillery's also making a cheaper version--Frostbite. Same basic recipe with a little grain added. And that also comes in raspberry, blueberry, birch syrup (which is delicious with Dr. Pepper), and probably some more I've forgotten.
And the Smoked Salmon vodka is actually really good! You have to try it in a Bloody Mary, though. Not a vodka for doing shots.
alaskadistillery.com and www.permafrostvodka.com