A good place to go would be Archival USA
http://shop.store.yahoo.com/archivalusa/

They have Document Repair Tape
A unique combination of a strong, very thin acid-
free tissue coated with an acid-free adhesive. It 
is non-yellowing and permanent, yet can be 
removed with mineral spirits. Size 1" x 400".

Among other things!
I just bought some cel books from them today.They 
have the best prices I've seen! 

Hope this helps :)
Sandra