I live in Alberta and we pay GST on meeting fees. It's $15.00/meeting + tax which equals $16.05 which is what I pay each week (that 5cents is a pain in the butt) and I am pretty sure that I paid tax on the initial fee as well.
I just joined up again here in Ontario and it was $79.00 for 5 weeks. I'm not sure if that included tax, but as far as I know it didn't - so I didn't pay any. Also, think about getting a letter from your doctor to waive the registration fee.