Get primatene or bronkaid tabs at ANY pharmacy (walgreens, CVS, walmart...) they are either 12.5 or 25mg ephedrine per pill w/some guaifenesin (standard cold medicine). you can get a box of 60 for 10 bucks.
you just have to go to the pharmacy counter, they are OTC but you have to like show your DL and whatnot to get them, i think for tracking purposes to make sure you aren't running a meth lab.