How about you find a buddy or someone on the forum that is upgrading that wouldn't mind buying it with a kit lens and re selling it. There seems to be a few people pre ordering the 5D III.

Personally though I am a little negative toward the 24-105mm. When I had my 50D I bought the 24-105mm to upgrade from the 28-135mm, I returned it after about four days and got the 24-70mm instead. Indoor performance at F4 was lacking and I really wanted the F/2.8. Then again after I bought my primes I wasn't happy with the 24-70mm so maybe I can't be pleased. If you had the cash and could make the stretch the new 24-70mm II might just be the ultimate. The charts for the lens are showing that it will have incredible IQ, possibly very close to what we get out of the L primes now.