I doubt that GAerlan has any left either, but its worth while giving him an email for sure.
Other than that on my seatpost page I have most of the length of available seatposts listed .....
I think the "longest" one would be a Kore seatpost and than the adapter on top to suit a regular saddle ....


http://www.thorusa.com/dahon/accessories/seatpost.htm



otherwise its more or less cutting a piece of bone out of your legs ...

Listen.
You dont need to be absolutely perfect like on a TDF race bike ....
relax, ride a little slower and enjoy nature..............

Thor