Pricing for a Jim Henson Music Piano Book

[kielia]

Hi I have not posted for a long time. I have a Jim Hanson's presents Very Easy Piano Favorites first edition song book featuring Rowlf. I have been unable to find out it's value . All I have found in my research so far is that it is supposed to be rare? Would anyone know where I could find information on it? I want to sell it.

Thanks for your time all,
Linda