Frankly, I'm interested in a storage system that would allow me to store my carts and booklets without the cases, as the cases take up way too much space. I've taken my carts & booklets out of their cases and put the cases into large totes in the attic. I keep the carts & booklets in flat-ish plastic totes in my craftroom, but it's not ideal.
I'd love something like the Artbin totes, but for those of use with 200+ carts, the number required would make it a very, very expensive system. Also, the several totes required would take up a lot of space. And the new carts have smaller booklets than the older carts, so booklet storage would have to be adjustable or accommodate both sizes without wasting space.
Artbin Cricut cartridge storage
A system that would accommodate hundreds of carts & booklets AND be affordable would rock my world for sure.