270 is ok for best buy, 2 local shops told me 300 & 325, plus tax for the onstar interface. for the steering interface they told me 125 & 150.

So, i bought online from US, and installed myself. Paid 159.00 (list price) and 45.00 (on sale), shipping & customs came to about 100. so i saved about 200. Saved the 650 they told me for install (and did a better job) Part numbers below. i already had some of the install parts and wire from my old car.

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Alpine CDA-9887, TUA-T500HD, CHA-S634, CHA-1204 & KCA-410C
Pioneer TS-A6981, 6 x GM-5100T
Kicker 2 x CVR15,
MBQ RCE-216
PG MX2
Soundgate LanStar1
PAC SWI-ALP