Adorama has the Canon EF 70-200mm f/2.8L IS II for $1699 (Reg $1999) as an “Open Box” sale. Adorama is an authorized Canon retailer, so you're guaranteed a 1 year Canon USA warranty with the purchase.
We've never heard a single complaint about Adorama's “open box” sales.
Canon EF 70-200mm f/2.8L IS II $1699 (Reg $1999)