Plastic Cassette Storage Tray - Holds 30 Audio Cassettes - Wall Mountable

A little bit expensive.

These are fine but I wish the slots were not as shallow. Would recommend overall for a cheap solution.

On the one hand, this is exactly what I needed to store my dungeon synth collection. On the other hand, they're charging an arm and a leg for some molded plastic that arrived in a pretty banged up condition. They shipped this in a thin plastic bag, rather than a box, and I had to spend an hour removing some strange sticky residue that had adhered itself to the thing. If you have access to a 3D printer or a woodshop, I recommend doing some DIY instead of buying this.