the local market will dictate to some extent.
Asheville runs $75 - $150 a month. Generally most programs are 2 classes a week w/ possibly some extra sparring or other one off classes thrown in.
oddly, it's the Mcdojo's that charge the most and give the least...
But, you can get your kid picked up from school and babysat till you get off work for $150 a month by unlicensed child care providers masquerading as karate schools. You couldn't get an afterschool program from a licensed child care provider for that so they have tons of kids. This will be the next big issue to arise besmirching the martial arts industry.
/rant
"George never did wake up. And, even all that talking didn't make death any easier...at least not for us. Maybe, in the end, all you can really hope for is that your last thought is a nice one...even if it's just about the taste of a nice cold beer."
"If you find the right balance between desperation and fear you can make people believe anything"
"Is enlightenment even possible? Or, did I drive by it like a missed exit?"
It's simpler than you think.
I could be completely wrong"