You asked "Where can I buy this AUX INPUT for $35.00 for my 2006 X5 with Nav?
My answer is "the dealer" That's where I bought mine.

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"What you hear in a great jazz band is the sound of democracy. “The jazz band works best when participation is shaped by intelligent communication.”
Harmony happens whenever different parts get to form a whole by means of congruity, concord, symetry, consistency, conformity, correspondence, agreement, accord, unity, consonance…….