There are not very many butchers in Markham, so that is a first plus.
This is my "go-to" butcher for wagyu beef, bone marrow, and quality steaks. The prices are not cheap but very reasonable for the quality.
It's best to call ahead of time if you're looking for something specific.
They also carry bulk hamburgers, frozen oxtail, duck breasts and specialty products (I.e various salts, sauces and cheese).