I'm definitely taking offers on the Serena cel in 
my gallery, drop me a feedback if you're 
interested.
Peruru would have to take a really serious offer 
to get me to part with but, you are welcome to 
try.  ^__ _^
I hope this helps.  There are also some shops 
that have pretty good ones.  Two examples I can 
think of are Anime Museum and Usagi's House.
Good Luck!