See Bilingual Extension Institute Home page for Tuition for the current year (Tuition costs for the Bilingual SLP Extension Institute are significantly lower than the Teachers College, Columbia University tuition for any other credit-bearing program).
Often school districts, out-patient clinics, and rehab centers reimburse students for the Institute. Please check where you work.
See the NYC DOE scholarships and incentives office for possible funding for those who work in the NYC DOE.