I have seen prices from $150 (indie) to $300 (dealership).
I had mine done at the dealership a few weeks ago for $295 minus my PCA 10% discount. I think I "over-paid" but the results are excellent, and it was convenient since the tires were being replaced. I watched the whole process. It took the tech just over an hour, start to finish.
The place I go to usually charges 100 for a 4 wheel align. They say because of the way the suspension is in the rear, they charge an extra 40, so $140.
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2002 Boxster S 6 Speed (Ocean Blue/Savannah)
-De-Snorkled, Porsche (B&M) Short Shifter, EVO Shift Linkage
-H7 HID Upgrade
-Rennwerke Maintained
1998 Bouvier (Brindle)