Skylink Garage Door Sensor (GM-434TL)

I read the instruction manual online before buying. It clearly states that the sensor communicates with a receiver. Unfortunately, Best Buy sells you the sensor, but doesn't include the receiver. This logic escapes me, as the product is useless when half the components are missing. The receiver is sold separately for another $40. I found the whole kit for cheaper at the online amaz-ing shop for less.

This Garage door sensor is exactly as advertised, but i didnt realise that i also need a receiver that BestBuy doesnt sell. Would be helpful if bestbuy would sell all that is needed.