Do you want it totally enclosed, open front, wood, plastic, very tall, or cubes? They're a lot of options out there. I'm here to help.
ProTech AFSBM 24 Slot Acrylic Display Case for 3" - 4" Action Figures (Wall-Mount), 18" W x 15.25" H x 2.5" D
Something like this is what I found. Ideally some material bugs won't eat, but strong enough to not crack or break off wall mount, and enclosed but able to easily open.
I did once see some misc toy cases at Daiso here, but didn't think if they'd fit TVC. They were stackable.