Initial fees vary according to region of the country and the size of the metro area. In my locale, around 25K initial fee, and then annual percentage fees after that.
And of course you normally need to have a background that demonstrates your likely ability to succeed with the franchise -- which usually means several years of experience buying and selling real estate.
That's just a generalization of what I've observed locally. I'm sure that the initial fee may be higher or lower for other areas of the country. Of course, each company has a contact person who will be more than happy to discuss franchise opportunities with you.
Good luck.