Xtreme Drag Audio (my old business) will install the following for:
-headunit: $10, not including install kit (i.e. wiring harness and/or dash kit)
-component speakers: $10, not including cost of brackets (if necessary: i.e. 5 1/4 speaker in a 6 1/2 opening)
-subwoofers boxed, amp, and wiring kit: $25
-all of the above: $40
-dvd player/playstation 2/x-box and in dash monitor: $20, not including cost for bracket (if necessary)
-head rest monitor: varies from $25 a piece to $100 a piece if reupholstered.
heres something cool, though: all merchandised purchased from XDA comes with free installation (except headrest monitors)
pretty damn good, eh? too bad i'm no longer in business...however, i'd still honor those prices if you want to swing by the house. shoot me a pm and i'll give you my #.
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