Genie Rotator Rotation index for 400 cards, 24-piece registers 200 transparent covers, of high-quality acrylic, rotatable Karteikasten (Office supplies & stationery)
The convenient rotary Karteikasten I can recommend. Here on Amazon was the cheapest option. These items vary the price and budget models are not easy to find. This one is handy, stable, robust and holds now since 2 Moanten and several twists.