Hello Kristina,

Sonic the Hedgehog cels from the ABC
Sat. AM series is like looking for needles in
a hay stack! Since I have been collecting
cels (5 years) I have not found one good
quality one up for sale that I'd want to buy.
Four years ago I saw some that had Princess
Sally or Bunny and Sonic on the cel with no 
background.
The cels were usually bought up by one retired
collector who has really nice gallery online 
(forgot
link). Sometimes they do pop up on E-Bay or
Van Eaton galleries for some crazy amount of 
money. The Sonic weekday series are cheap
compared to what the ABC ones go for!
If I remember correctly the reason why they
are so rare is because SEGA didn't like how
the shows mistreated the copywrite or something
and took all the cels to Japan and locked them 
up or something... I heard this when I was
at Comic Con at the Van Eaton gallery booth.
I wish I could afford one, but they are
rare. I hope this helps a bit! Good luck on
your search!

Garrett

heh... Ironic that you bring this topic up
because I just bought a Sonic TV cel. lol