The fee itself doesn't sound too unreasonable to me. Some other things to look for are: frequency of testing and number of tests.
One of our students was talking to his sister-in-law's boyfriend, this fellow has been promoted five times in five months in the art he studies. He has no previous MA experience. Our student didn't ask how much he was paying for these tests or how many he was expected to go through. In comparison our student has been tested five times in five years (but he did get skipped a rank once). Another lady who used to train with us was dan grade in another art. She told us that her first kyu
level test, of which there were ten, was $100 U.S. and they kept going up from there