where can I get these for a good price in Canada?

I think Performance Improvements has/or can get them. There's one in Guelph no idea what their pricing is like. Or you can try Northern Motorsports in Hamilton, although they have to order them in and I waited for over 3 weeks before I cancelled my order and ordered from a GP that was being run here on the .org. RSM has a slotted rotor too, but the price seems a little steep.