I ordered a set from Chaparral.com this week. They have good prices on the BT-016, but not so much on other tires. I got an email last night that says the rear shipped out already, but that the front is back ordered. Need to find out how long because I'm planning on putting these on before I do my track day so I need it soon.
My friend has ordered from Ron Ayers a lot of times and he keeps nagging me to buy from there. I ordered from Chaparral because I needed a few other items and they were one of the only places that carried everything I needed. They do offer free shipping on tires (in the US of course) but maybe they'll cut a good deal on shipping to Canada.