I know there's a couple of places like pcdawg said out in Markham.
Only places I know specifically that I've seen carry Japanese TF's are the Silver Snail downtown (On Queen St, between the intersections of John and Spadina) and Anime Xtreme (Near Silver Snail on Spadina, just North of Dundas West). However I would not recommend either of them personally, pretty expensive and overinflated prices, probably cheaper just to buy them eBay/online even with shipping, USD, etc....
Or you could check out the banner links on your right they're a good place to start too