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You can buy FM modulators at a number of different places - WalMart, Target, Radio Shack and almost any store that sells auto audio products. typical price is in the $25 to $40 range.
Using an FM modulator is absolutely the WORST way to get a satellite radio signal into the radio. Feeding through the AUX will yield far better audio quality than the FM modulator. The FM radio part of the RF system has to be one of the poorest implementations I have experienced in an automobile. The rf gain is poor and its frequency response is awful.
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