From B&H Photo
B&H Photo is selling the Canon EF 24-70 f/2.8L II for $1799 (Reg $2299) after mail-in rebate. Shipping is free within the USA and also qualifies for B&H's 2% rewards.
You must proceed to checkout to see the $2099 checkout price, and then there's a $300 mail-in rebate above and beyond that. That brings the price of the lens down to $1799.
You can see the rebates for all Canon lenses here.