After a few days of struggling with the decision, I called the woman to negotiate the price. I told her that I wanted to do the "psychoeducational evaluation" with her but that it was too expensive for me. I asked if it could be less. She answered "yes, sure, what figure did you have in mind"?. Honestly, the fair number I had in my mind was about 50 bucks, but I assumed that she woudn't give me a 99% discount, so I tried for a more realistic number. I offered 20% less of her initial price and I asked if I can pay in two payments, half before and half when the evaluation was done.
To my surprise, she accepted with no hesitation, which left me with mixed feeelings. First I regretted not asking for 30% or 40% or 50% less because perhaps she was expecting for a much aggressive number and I came too shy. Second, I thought that perhaphs she was desperate for customers because I might have been her first one in years and she couldn't afford to loose me, which would means that she was not as good as I expected.
Nevertheless I decided that none of these thoughts was helping me so I convinced myself to feel happy with the 20% discount (with represented a three figure number).
Despite of all my doubts, frustration and feelings of being ripped-off, I accepted the fee and scheduled the first appointment for the evaluation process.