There's a lot of them in the state. Start by looking at a Little Nickel paper. They're at almost all stores and free. Usually the front page is half filled up with either dispensaries or doctors. There are some out there charging considerably less than $200.
Be leary of any that don';t have a doctor on site or are in a dispensary building. Doctors in Washington are not allowed to work out of anywhere that sells cannabis. And a few doctors are doing video conferencing which is illegal in Washington. You have to physically see the doctor. Other than that they are all legal.
This info is all for Washington state of course.Its different in every state.