There is wasabi being cultivated in Canada, but I assume the majority of it is exported.
Fresh Wasabi - Wasabi Essentials Ltd
100$ for 250 grams of Wasabi rhizomesNorth Americas only commercial grower of high-quality water-grown authentic Wasabi (Wasabia japonica).
130$ for 100 grams of Wasabi freeze-dried powder
or 5.74$ per 100 grams for the fake stuff at Walmart.