Adorama has the 70-300L for $1100 in-cart price. That's about the best deal you'll find on it new.
http://www.the-digital-picture.com/N...aspx?News=3844
B&H has the same promotion I think.
That is almost 30% off from what I paid for it when first released.
The 100L and 70-200/2.8II as well. Could be more but have not checked.