Everything in my collection is framed. When I 
got into collecting I decided I would keep my 
collection small so that I wouldn't have to hide 
some of my cels in a book. It's not as limiting 
as you'd think... I don't buy something I can't 
figure out how to frame nicely :) To keep the 
cost down, I pick out my own acid-free mats at 
the local craft store, along with one of two 
frame styles I've become fond of using, and 
mount the cel using acid-free tape (at the top 
only!) I've had cels on the walls for the past 
two years with no noticible signs of damage 
:D If you follow the guidelines that are out 
there for framing, I don't see why you can't 
save some money and frame the cels 
yourself... oversized items being the exception, 
of course.