How available is Zombie Dust in the Chicago area? Particularly near O'Hara airport? I would like to fly into O'hara Int airport for the day and pick up 12 or 24 Zombie Dust, pack suitcase and check bag in for flight back to LA. Is there a store near the airport via the "L" line that I can get to with Zombie Dust available? Or is this usually gone when it hits the shelves? And how much for a 6 pack or 12 pack? Thank you guys.