There are currently 13 Sigma lenses for the Canon EF mount that are on sale, you can view them all at B&H Photo.
A lot of popular zoom lenses are on sale, including:
- Sigma 150-600mm f/5-6.3 DG OS HSM Contemporary
- Sigma 150-600mm f/5-6.3 DG OS HSM Sports
- Sigma 50-500mm f/4.5-6.3 APO DG OS HSM
- Sigma 70-200mm f/2.8 EX DG APO OS HSM