If you buy the voucher directly from sun, it will cost $CAN. 200(plus 10$ tax)
If you buy it from a Prometric center, it will cost $CAD 300.
Before purchasing the voucher, on the Sun's website, click on the WORLDWIDE link(at the top right corner) and then choose Canada as the country.
By the way, I am staying at Mississauga, Canada.
I have just started my preparation for SCJP
Which city in Canada are you from?
Let me know if you are interested in helping each other for the preparation of SCJP.