I agree with BlueTornado. I have a couple of friends who are teachers. The schools (one in Delta and one in Vancouver) still have some cheap aluminum and sometimes wooden rackets for the kids to use. Donate them to your old high school.
Off the top of my head...probably some east van schools: Van Tech, Gladstone, Windermere, David Thomspon, John Oliver, Britannia, Templeton, Tupper. http://www.vsb.bc.ca/schools Choose a secondary school close to you. Contact the school and ask them if they want some old used badminton rackets. I doubt they will say no.
Give them to a charity shop - I know if I donated them to my old school they'd get destroyed by all the people that are not interested in badminton!