who did you buy from on amazon for 539? was it an authorized dealer?
oops! the link i posted is for f90bt! not f900bt.
http://www.amazon.com/exec/obidos/tg/de ... N&v=glance
this is kinda old, and you probably got your stuff installed already.. but if you haven't.. a friend of mine told me he paid 130 at advantage audio in Brea.