Not seen that large, but $2 type shops have ones that are only 1 wide 2 high all over the place.

We used to have them.  I've got a couple that have all my old CDs in (I chucked the cases).  I never use the CDs as they're all ripped/spotify.   But you were able to get them.  Possibly the warehouse/warehouse stationery.

Thanks for the replies. I have decided to purchase several smaller wallets instead - these are still readily available brand-new.