walmart sells it in the camping section in a yellow bottle, about 10bucks but you gotta look real hard in the bug section or you will miss it. It is also great to spray on your equipment (bag, hammock, tent etc...) one treatment will last about 6 months. I haven't tried what vc is talking about with the pet spray but if its cheaper its a great idea and makes since. the bottle in the camping department is fairly large.
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