At the beginning of the summer, I bought a Mosquito Magnet from Costco. I was looking for a natural way to get rid of the mosquitoes and so I tried out the Mosquito Magnet. But, it didn't really catch that many mosquitoes. It runs off of a propane tank (and electricity) and goes through a whole tank per month. But, it probably only caught less than 20 mosquitoes per tank. So, it ends up like paying $1 for each mosquito killed. So, I decided to return it to Costco. Fortunately, Costco has a very generous return policy. And when I went to return it today, they gladly accepted it back, even though I had used it for several months.