When you read the booklets they send, you will 
see the kind of care your art will receive.  
These people can fix just about anything, but 
it's very painstaking.  They go through tons of 
research to match colors properly, paint lines 
the same thickness, and prevent the cel from 
gaining anymore damage.  I think the prices they 
charge are quite fine.  You're asking them to 
restore animation art, restoring any art takes a 
skilled hand, time, equipment and knowledge.  I 
feel that paying for those things to have a cel 
that's important you to restored to it's original 
beauty is well worth it.  I plan on sending them 
a few things later on myself.  Depending on what 
the damage is to the cel, there are also other 
places that can help.  Pierro Tonin can help too, 
but I dont have their address.  Use Google to 
search for them :)  Good luck!