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Antiope Corp [amazon.com] via Amazon has Guardline Wireless Driveway Alarm w/ 500′ Range (1 Sensors + 1 Receiver) on sale for $ 29.50 when you ‘clip’ the 50% off coupon on the product page. Shipping is free.

I purchased this sensor and receiver last time there was a frontpage deal and it’s worked flawlessly by the driveway. It works well to inform you when someone is approaching your home, provided they are in sensor range.