If you want to do the swap as soon as possible, you will need to pay some serious $$.
Or you can take youre time and shop around, Ebay has them for as low as $300 each, but you need to check often.
Here is a nice set:
http://cgi.ebay.com/ebaymotors/2010-...item2307fab7c0
As far as the wiring, you will need to order it from AAC, but you will need to order a set of plugs from GM. because AAC does not include the plug.
The installations is pretty straight forward if you are comfortable with wiring. if you have installed a stereo or speakers before you should be fine.
If you have any more questions shoot me a P.M. i recently installed mine.