GFE will run you higher than BS or FS since what you are getting is not the feeling that you are with a sex worker but with you sweet heart from high school.
The ones who know how to do it leave you day dreaming about them for a few days after.
To get an idea of the price, call HFH inquire about your lady, to see if she is working that day ? once you confirm she is in ask them does she do GFE, then ask what is her base price.
It has been a while since I did GFE. but last time FS was $150 and GFE was $250 but with the right lady is worth the money.