New double-dip: B&H Photo Video has the Canon TS-E 24mm f/3.5L II for $1799.00, after a $200 mail-in rebate. This ties for the cheapest price ever seen for this recently refreshed (2010) lens from an authorized dealer.
Add to cart to see the discount.
This lens is also a favorite amongst architecture and landscape photographers, you can see great sample photos from this lens in the TS-E 24mm f/3.5L II Flickr pool.