The Canon Store has also dropped prices on their refurbished "L" lenses. I just ordered the 24-70/4 L IS priced at $749 before tax and shipping. Good deal.
I guess they had to drop prices on the refurbs. The 24-70 f/4 was not selling, and many users who are spending a lot of money would step up to the f/2.8 model. It is about the same quality as the 24-105L at a huge price differential. They will drop to $7oo by Christmas.