The actual custom fitting service is usually free, however, if you want specialist grips and shafts it can get quite expensive.
ANSWER:
If You are buying new clubs , fitiing should be included at no extra charge - any reputable retailer should not charge you more for fitting . But, most fitting pros charge a modest fee, perhaps $35 to $50 being typical.
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To get things to your specifications such as custom grip size, shaft length, loft and lie are usually done for free, but things such as custom grinds, specialist grips and specialist shafts can cost quite a bit more.
I highly recommend custom fitting whenever you get new clubs, you will notice the difference in your game.