The school district has a policy regarding financial hardship for students, and how students shouldn’t be denied opportunities because their parents can’t afford to pay for things such as field trips:
The Board of Education of School District No. 57 (Prince George) is committed to ensuring that no student is denied an opportunity to participate in a course, class or program because of financial hardship.

http://www.sd57.bc.ca/fileadmin/cao.sd57.bc.ca/Policy_Manual/Policies/5101.pdf

If parents are having difficulty, they are encouraged to contact their school administration to ask for information about the hardship application process. As per policy:

“The hardship application process may be formal or informal.  The process must always, however, respect an individual’s privacy and dignity and adhere to strict principles of confidentiality and fairness. “