$100 for a tune to load is about the standard going rate. it depends on who the shop is and if you trust their tunes also. There is a well known shop 10 minutes from me that does custom tuning and I would not let them touch my lawnmower much less my car.
2000 Mustang GT Steeda #0048 34k miles. 99 Cobra 4V swapped, FTBR IRS swapped, exhaust, tuned by James Gordon.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.