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Make your own for much less
as others have said, a homemade trap will cost you much less. Put some apple cider vinegar or balsamic vinegar in a jar (I have even used baby food ones), add a few drops of dish soap to break up the surface tension of the water, shake gently and set out. Within 30 minutes, more than half of my flies were trapped in the liquid. Even if you don't use the rest of the vinegar for cooking, it will only cost you a couple of bucks to make this trap. it's been a savior here in Europe where there are no screens or air conditioning so they come in the open windows quite freely.
