https://www.amazon.com/Thermacell-Backyards-Properties-Environmentally-Alternative/dp/B098MV9T8L
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I SWEAR by these guys. I think they are legit and have greatly reduced my ticks. I think making your own is a lot cheaper. I also spray the premetherin around my yard 3-4 times a year but I think these tubes work just as well or better.