Because I have mentioned how well the Cube 3D printers travel, people have asked what carts I use. I had purchased mine from Staples and they no longer carried them. And, unfortunately, I could not remember the brand name.
I've finally found it!
It's the Smart Cart series from dBest.
Staples had carried two sizes.. the Smart Cart and the Bigger Smart Cart. I prefer the Bigger Smart Cart; but, both work. The large version allows you to carry extra cartridges. Both are relatively inexpensive and priceless if you need to carry your Cube with you.
I also found an Amazon source for what I believe is the smaller of the two models.