Door lock issue - 2008 GT

[TTSaleen]

So my passenger front door lock is 50% operation. 1/2 time it works and other 1/2 it does not.
My driver rear door lock is dead and doesn't lock or unlock.

What company is currently stocking these and has the best price?

Thanks,
Ryan

[TTSaleen]

Big thanks to Crazy Paul for the updated lock information!

Here's information about the locks =
Passenger side front. GM#92215256 supercedes to 92236013
Driver side rear. GM#92215255 supercedes to 92236012
The original Part Numbers are now obsolete, but the new part numbers are for a 2011+ Caprice and work great!
I got both of my locks for under $122 delivered from GMpartsgiant.

Time required is about what it takes to leisurely drink this tasty beverage.

http://i108.photobucket.com/albums/n28/98saleen/2008%20G8%20GT/G8%20locks%206_zpsadque3ry.png

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http://i108.photobucket.com/albums/n28/98saleen/2008%20G8%20GT/G8%20locks%203_zpsscsi2d1j.png

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http://i108.photobucket.com/albums/n28/98saleen/2008%20G8%20GT/G8%20locks%202_zps1mcggsxh.png