Driveway Sensor ?

Does anyone know of a good driveway sensor that won't break the bank ? I am wanting one for our long drive so I can tell when people might be driving in. Are there remote ones ? As our entrance is about 100 yards away from the house. Thanks, Iowa883
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Iowa883 wrote:

http://www.google.com/search?hl=en&ie=ISO-8859-1&q=remote+driveway+sensor
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Iowa883 wrote:

http://www.alltiresupply.com/Merchant2/merchant.mv?Screen=PROD&Product_Code=M-805
Best regards, Bob
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Iowa883 wrote:

http://www.cartell.com /
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