I've only seen two cels from the Hobbit and from
Return of the King... both were on eBay...
One was an utterly FANTASTIC cel of Bilbo with
his pipe standing in front of his hobbit-hole from
the beginning-part of The Hobbit... I think the
BG was laser copy but don't remember (and since
I've had several harddrive crashes and eventually
got a new computer, I don't have the saved pic
anymore... :P This was probably a year and a
half or more ago...)
The other was a smaller, full-body shot of the
bard from Return of the King (the one that
keeps singing that truly irritating Frodo of the
Nine Fingers song)... it was from right before
he starts to "sing" us into the story... I
think Mikichan (JunkJungle?) auctioned this one
on eBay under the incorrect title of Last Unicorn
then changed it to The Hobbit (although it was
actually Return of the King)... this was also
probably a year or so ago...
I haven't seen any others... only cels from
Lord of the Rings (and the art in that movie
was SOOOO terrible)...
aka Lady Zatara