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For my GT, it cost me $450 cash for a full dyno tune w/ A/F Ratio corrected and everything. It only took 3 pulls to get the car where it needed to be. So for 3 pulls w/o wideband around me is around $100 or so. With wideband it's around $150...
I was told $500 by a shop near here one time for a dyno tune, however they are one of the more expensive shops (they mainly focus on BIG builds), so you can probably find it lower than that some places.