I don't know about everybody else, but I don't like buying deodorant - the aluminum is suspect in things like breast cancer, and the plastic container doesn't impress me. So a friend of mine gave me this recipe for a natural, home-made deodorant:
1/4 cup coconut oil
1/4 cup corn starch
1/4 cup baking soda (they specify aluminum free, but I'm not sure what the concern is there - my baking soda doesn't include aluminum - maybe some do?)
Put all ingredients into a saucepan and heat over low, stirring constantly until the oil is melted and it is all smooth. Pour liquid into any container - an old deodorant container apparently works. I poured mine into a toilet paper tube - that way I can rip the tube off and still have it all together. If you live in a warmer climate than we do, you may have to refrigerate - or apply with your fingers.
I haven't done it yet, but you can also add a little bit of grated beeswax (1 tbsp or so) to the mix. It apparently keeps it from melting as quickly, and adds a nice smell.
So far, I really like it. It works better than the crystal that I bought, and I feel much better applying this to my skin than one of the commercial deodorants.