norQuin https://www.quinoa.com/
Says no other allergens in their facilities. Grown in Canada.
I sent them an email to ask for more details on their allergen statement. Where were you able to find this? It sounds like they have multiple different quinoa products, which would be really great for us.
UPDATE: They only process quinoa in their facility, no other foods. You can order directly from the company by emailing or calling them, too. They're not widely available in BC, but I'll definitely order some to try.