I got this cart, Household Essentials Jumbo 3-Tier Metal Cart with Wheels, White, on Amazon for my daughter's homeschool items. I store it in the corner when not in use, and pull it out to where we decide to do our work - it changes from day to day. I can even roll it outside on the concrete. The trays are deep enough to hold standard sized paper and workbooks, and wide enough to store paper and workbooks on the same shelf. I've got them going two different directions to fit(see picture).
The price is relatively low because it is not a heavy utility card, but a light weight cart designed for light weight items. We have solid surface floors and the casters work just fine on these - no scratches on the floor. It is also light enough to pick up by the handles to carry .
Cart is white wire with measurements of 24-inch width by 32-1/2-inch height by 14-inch depth.