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The "jumbo card box" series from All Rolled Up perfectly fit Onus armies: 2 armies per card box. Search this page for "jumbo":
As of this writing, the boxes are only 0.50 GBP each.
Some pictures of these boxes holding the 8 Onus armies can be found here:
(i am in no way associated with All Rolled Up, i'm just presenting an inexpensive Onus card storage option using their products.)