somtimes theres alot more too it than just "buy a new deck".
most hondas etc will just slip out the stock head unit and then slip in a new universal sized aftermarket deck simple as that.
for example, i got a double din screen for my 05 cts without looking into install.
turns out, because the "entertainment centre" is practically all one big piece, that the dash would need to be heavily modified just to fit a single or double din aftermarket head unit.
were talking relocate the cd player, rewire the heads up display, rewiring steering wheel controls, cutting and remolding the entire stock face plate/dash.
quotes i had were pushing $1k from reputable shops.
needless to say, i sold the deck, bought a aux input, had a shop install it for $100 and it was the best thing ever.
my dash isnt all hacked to shit, the car still looks completely stock, and i saved about $900.
if you cant just buy a new universal head unit than buy a aux.
and if you dont know what youre doing, have someone install it for you, its cheap enough.
hope that helps