Actually, I have met teachers who charge from 200 euros to 500 euros for a lesson.
Luckily I study with one at school, where I dont have to pay anything.
Just make sure its worth it. The teacher you need depeneds on your necesities. For someone no trying for a career as a concert pianist or competitions or whatever, at a postgraduate level for example, it might not be worth it. You might no be ready for what these kinds of teachers can tell you, or you might not understand it yet, or it might not be of any practical use to you at the moment.
It is important to know in what stage of your learning you are now. Begginer, Intermediate, Advanced, Professional?