Expected cost to replace macbook heat sink

Does anyone know how much it would cost have have apple replace the heat sink in my early 2008 model macbook? The warranty is obviously gone, but other than the fact that it overheats, the computer is in fine condition. here are my basic specs.
2008 model mac book (black)
2.4 ghz intel core 2 duo prcessor
2 gb 667 MHz DDR2 SDRAM (upgraded from 2 GB by user)
Intel GMA X3100 144 mb graphics
running lion OSX
I don't trust myself with opening up the main casing, I barely trusted myself upgrading the RAM.
Approx cost anyone?

The heat sink and fan are an assembly. What makes you think there's a problem with the heat sink specifically? Have you reset the SMC?
Laptops with a battery you can remove
Shut down the computer.
Disconnect the MagSafe power adapter from the computer, if it's connected.
Remove the battery.
Press and hold the power button for 5 seconds.
Release the power button.
Reconnect the battery and MagSafe power adapter.
Press the power button to turn on the computer.

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Expected cost to replace macbook heat sink

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