I was in my local camera shop talking to the sales rep about the 24-70, and I mentioned I was interested in the 70-200 f/4L IS. He tells me they have a second hand one out the back that they're willing to sell for $900! (£380 or $570 USD) The shop sells this lens for around $1500 new, and they'll be about $1900 after the 15th of December due to the flailing aussie dollar.
This has happened at the same time that my 24-70mm f/2.8L has arrived in the shop as well. These will be my first L lenses, and I'll have them both in a week's time!