| Well, i'm not sure on mail order stuff, as up here in Canada I don't think that's an option for us.... thou I could be wrong.
But if i was you, i would always have extra supplies around if you could manage it! Timing it "just right" and hoping the mail comes seems a bit risky to me....... You never know when you will break a vial (been there, done that) or have a vial that's gone bad.
Unlike some medications where it'll be "ok" if you miss a day or two, this is the stuff that keeps us alive! I know I wouldn't want to mess with it. | 
