There's a dealer locator on either the US or UK site. The only dealer I could find near the GTA is called The Garage Motorsports in Barrie - they have them listed on their web site - thegaragemotorsport.com. I haven't contacted them to see if they have any in stock.
I called and i believe they charge around $350 plus around 4-5 hours of labour plus alignment. You are better off going to a Volkswagen dealership unless you are planning to install yourself.
I ordered mine from here http://www.ngpracing.com/home/
came to about $420 CDN with shipping. I have a guy who will install these for about $200, 1/3 of what any VW dealer could do it for.
Install is not the problem, as there's tons of quality mechanics around the GTA.
Getting the actual springs is the problem....cross border shipping + duty + taxes + EXCHANGE RATE = GG
Good luck, after conversion to cdn dollars I payed $420 for springs with shipping + $120 for duties. I will recoup most of it when I sell them back again after 2 seasons of use.