Whoah, some of you are paying WAY too much for lessons!
The least I've ever payed is $15 the most is $35. All hour lessons.
I pay $30 for an hour group lesson which, depending, can count as semi-private really. I live in NY and train under an instructor which has won shows and ride on the school's horses. (Some I ride could be considered "show" horses).
The MOST expensive lesson I've seen around here is $50. That's for a super-fancy barn with XC courses, a jump arena (though my barn has that too), top-quality instructors and horses, etc.