I second the Diatomaceous Earth. You can get this definately at a garden store in a small container. I got ours in a 50# bag at the feed store. They had to order it in for me. It was around $16 for the whole bag. I have used it for mites in the chicken house, dusted the dog to keep ticks off, and I put it in my mineral to worm my cattle. You can also put it behind your cabinets, washing machine, etc to prevent/ get rid of roaches/ants etc. I have also used it with fair success in my garden for bug control. Good Stuff! And it is not poisonous. If you are going to scatter quite a bit of it, I recommend using a dust mask, because from what I have read, it can be a lung irriatant. But that would only make sense because it is a fine powder, like flour.