Hi
As it happens I paid our fees yesterday
The fees that apply if you are sponsoring a spouse are:
1. 75.00 CAD for you (sponsor)
2. 475.00 CAD for your spouse (Principal Applicant)
3. 490.00 CAD for the Visa if its approved (Right of Permanent Residence Fee)
You can opt to not pay the 3rd as I did but the first two must be paid upon delivery of your application package.
BTW I will eventually pay the (Right of Permanent Residence Fee) but its going to be in a couple of months.
I suggest that you pay all at once to avoid any delays
Regards
messenger