I use the same. They have "demo" sized ones that are very small and will last a surprisingly long time. It's the cleanest deodorant I've ever used...it's like not wearing anything which I like. However, you'll have to test it out and keep a nose to things for a while until you know it's working properly. I sometimes wonder, but so far I think it's good, and my wife assures me that it's working. =)

-Jeremy