The 211 La Salle badge is a cadet badge, circa 1915. A reminder of this
link for all cadet stuff (I'm pretty sure it was posted on the forum previously).
Like Bill A says, almost all COTC badges can be found in the $5-$12 CDN range, with a few exceptions. In addition to the Osgoode Hall badge he mentioned ($475-$500), there is the French version Royal Military College ($90 last I saw sell), St. Mary's College ($70-$110) which then became St. Mary's University in '44 ($40), University of Ottawa ($20-$40), Acadia ($25-$27). Prices are my jottings of ebay 'sold' prices from the last couple of years.
Mazeas doesn't show one COTC badge, Ontario Agricultural & Veterinarian College.
Finally, there are a couple I've never seen offered for sale, from Mazeas, the Laval University Contingent badge (COTC 12) and the La Salle Contingent badge (COTC 13), so I don't have any idea of those values.