Does anyone know an auction house for original Jim Henson sketches?

[oscawana]

I have been searching for an art action house that handles original Jim Henson sketches. I have an Large original sketch of Kermit done by Jim while he was on the set of "The Muppets take Manhattan." If anyone knows who I can contact, please let me know.
thanks

[sesameguy]

That's a real treasure- you may want to try contacting the Jim Henson Foundation. If they're not able to buy the sketch, they may be able to refer you to an auction house or another collector that can take it.

http://www.hensonfoundation.org/

[muppetperson]

I was the highest bidder for it on ebay, but I guess the reserve is too high.