This is not an uncommon lens on Clubsnap BnS. Just that it does not appear daily for the same mount. The uncommon one would be 10-24 from nikon and tamron. Nikon's being too expensive and Tamron being very badly reviewed.
A little OT, I feel those lens that are more commonly found on BnS are more likely to be good and popular lenses. And this 11-16mm F/2.8 is a great gem of it's own.