I will ask them if they will ship it flat and any
extra cost I'd pay.  Though I know cel paint is
supposed to be durable, I really don't want to
risk it chipping or sticking together.  

I believe they should be able to take two priority
mail boxes and tape them together or perhaps go to
some office supply store to find a box that will
fit it and then just keep it flat.  I'm a little
worried they wont cover the cels to keep them from
sticking to anything inside a priority box, they
don't really seem to be to used to cels.

I've never recieved such oversized cels before so
I was interested in seeing how others had recieved
them.

Thank you, 
nesuferit.