Almost any good health food store will carry Ghee, you can even get it certified organic if that matters to you.  Definitely be sure to buy the real thing, namely clarified butter.  While you can make it yourself it's kind of labor intensive considering it sells for about $3.50 a pound.  When I bought it it was liquid but over the course of the trip it kind of entered that in-between state, not quite liquid, not quite solid.  At any rate we carried it in a Nalgene screw top and it was fine.  To me, the idea of frying a fillet of freshly caught fish in Crisco is criminal (I'm taking my stand right here!) and I've never had great luck with butter beyond a week or so.  So Ghee is my new religion and that's all I've got to say about that.