I recently purchased a 'card tray' at Office Depot. It's for the huge index cards (5x8?). I was looking for something in which to store my personal-sized Filofax inserts. Laying them flat and paper-clipped in the original, individual FF boxes wasn't cutting it, it just made me confused because I couldn't see them.
So this seems like a workable solution. I think the box was around twelve buckeroos.
This is what it looks like with the lid on.
Right now I'm on the tail end of a Filofax hunting and gathering frenzy. I started January with only one Filofax, the pocket-sized Urban. Now I have (all leather,and not counting the Urban) one A5, two personal, two compact, one slimline, three pockets, and one mini.
Yes, my Christmas and birthday money went kaplooey. I love my FFs.