Nothing: The school is entirely free.
(This school is entirely free and offers grants, thanks to donations and to the fact that it is entirely self-organised by volunteering linguists. You can contribute to this organisation through a registration/donation. )
Almost nothing: We are still in negociations, but it should be that the accomodation is provided for 5 Euros / night.
Almost nothing: On-site life is cheap
Nothing: There are grants