I charge $150 for a bike fit. My typical fit takes two hours. I also guarantee my fit, which means if a client isn't happy, I will see them again at no charge (as long as they haven't changed anything wrt their fit). In six years, I've only seen three clients more than once.

All coaches/fitters/bike shops are different in their fees. Some charge by the hour. Most don't guarantee their fit. Some charge additional for cleat positioning. Fees tend to be lower at bike shops than with coaches/fitters. And fees tend to be lower in smaller cities than in large cities like SF or Seatle. I personally think you get what you pay for. If you pay $75, you're likely to get less attention (and less expertise) than if you spend $150.

Regardless of where you go for fit, find out the fitter's experience and credentials. How many fits do they do a week? Do they fit a lot of women? Where did they learn their trade? Do they have any certifications?

Word of mouth can be a valuable tool. If someone is happy with their fit, find out where they got it.

I encourage you to think of fit as an investment in your riding career.