I'd defenatley not bring powder with on a plane! Your vacation might be a bit longer than you planned if you do.
And shipping can be done, but there is a 20$ Hazemat fee,above the cost of postage.
Just off the top of my head I'd try the yellow pages.Many web home page sites offer yellow page service. Just enter Memphis,then sporting goods,or shooting sports.
Ya might get lucky and find a toll free#. If there are any relatives in the area,it might be a good Idea to have someone get a pound early, there is usually a mad dash for powder just before hunting season.
just a few ideas,tacks.