Our club charges a $25 Registration (one time), and $35 monthly tuition, no contracts. Also, we have a family plan of $100 a month, for up to five family members. This includes three, one hour classes a week.
Testings are quarterly, and are also $35 for all colored belts.
Wow. Looking at this I'm extremely glad I'm training through my University! Our fee is 10 Euro (about $13) for the college year with unlimited classes all of which are 2 hours minimum. We have to pay for all our competitions but that's it...
I teach out of my church. My program is a ministry of the church. I charge $50 per month & have 4 classes a week (beginner & advanced). Usually students do one or the other. The church takes out $50 a month for utilities. My overhead is next to nothing.
In Los Angeles, where I am, the lowest price for a commercial school is $125.00 a month. I've seen $200-$400 per month here in my town.