stereo installation question.

[chefsung]

So Im about to pull the trigger on the pioneer 4400bh.
and along with that, i was thinking about the review camera also.
Since im bad at the whole wiring and stuff... i was just wondering how much would shop charge me for this.
I would probably buy all the things from amazon or somewhere but not at a local shop. because i think they charge more for the product plus including tax.
nobody like tax right? lol

so bottom line is... what is reasonable and how much is isn't.

Thanks.