A few quotes from the Rabbi on 'Customs of Israel'
the custom clearly being that ritual circumcisers take no fee.
It is the custom that circumcisers take no fee for circumcision and that they vie with one another for the privilege. Many of them even go from one town to another, where there is no circumciser, and take no fee aside from travel expenses. The more meticulously observant ones among them even pay the travel expenses out their own pockets.
Brit Kehuna Hashalem, p. 277b, 1940