I hope there not too expensive because many will fall at the hands of flyswatters, newspapers, and my personal favorite, a homemade flame thrower with a can of WD-40 and a lighter. On a serious note this is very concerning. I imagine they have already been using these things on us. Heck, we probably will be attracting some this summer ourselves with the way things are going on the home front. It never stops does it? They just will not give up. And that makes our job of fighting it even more difficult. But, we shall survive this coming nightmare I hope.