Most schools do offer tuition assistance.It is generally harder to get for Kindergarten than it is to get for grade school because Kindergarten is already cheaper than grade school and because the school wants to invest in families that it knows will be continuing at the school. Many families leave after Kindergarten either because they always planned to or because they have discovered that they just can't afford it.
It is something our school struggles with all the time. We are trying to increase our scholarship/tuition assistance fund but it is very difficult. Essentially, when your child receives assistance it is because the other families in the school have given extra to support the economic diversity of the school. What is happening now is that we are losing our middle class families because they can't afford the tuition and they don't qualify for tuition assistance. What is left are the wealthy families and the lower income families. No one wants the school to be elitest but the teachers don't work for free and their medical care is expensive. Plus many schools are paying off loans for their buildings. Our tuition is less than the other 2 Waldorf schools because they are still paying off their buildings while we have refinanced and lowered payments.