Ted, Sorry I can't help you, but I have an idea. I know 5x7 is not as popular as 4x5 but here is what I did. I just bought two boxes of the same type of film. Put them all in one box. When your done you got two emptys and then your set for awhile. I know it sounds to silly to pass along but I didn't think of it someone suggested to me. Perhaps it will work for you. Greg Orlando