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 5.0
Which city in Canada are you from?
Let me know if you are interested in helping each other for the preparation of SCJP.