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I have read permethrin sprayed on your yard will kill them. I havent tried it yet. It may also kill frogs and cats if you have any.
We spray our yard about once every two to three weeks to keep them away. We have alot of bushes and shade. Plus our neighbor doesn't rake his leaves and has a huge bamboo patch. If it is dry you don't have to spray as much, if it rains alot you have to spray more offen.
We bought a 4 gallon backpack sprayer and it takes about 30 minutes or so to spray all the bushes in out 1.5 acre yard. Cost is about $10 a month but well worth it. Without the spray we can't get from the garage to the hosue without getting bit (30 yard walk). Now if you are outside for an hour or so you will get bit once or twice at most.
Didn't know about frogs, but it will kill cats. I personally hate all cats that are in my yard (And the scratches and paw prints on my cars, smell of cat piss, etc.), so it doesn't bother me. Don't mind cats that stay in there owners yard, but I don't spray there......