If you can get your club (Mississauga?) to work with you you should be able to get a school gym for free (well, you pay admin fees). The Ontario government will pay the rental fees for non-profit orgs to use their gyms. The only catch is you a) require your own insurance and b) have to show your non-profit status. MAAC sanctioned clubs meet both of these.
If you're flying at a commercial building then it's a different story
. But if not you might want to check out:
http://www.edu.gov.on.ca/eng/general...y/program.html
Hope this is helpful. (Oh, and I think the Catholic board also has a similar thing going.)
J