Thanks for the help, everyone! I found them at Bon Marché!
I'll have to check out that Epicerie near République for fun.
Does anyone know where one can find steel-cut oats in Paris? I'd prefer not to order them online but I can't for the life of me find any stores / boutiques that stock steel-cut oats!
I've tried Naturalia and a few other "Bio" stores, but to no avail!