Camera carts are wonderful things when working in the studio or at certain locations. That is to say, locations with a lot of flat ground that small wheels work on. Proper studio carts, however, can be expensive.
There are plenty of roller carts out there for other purposes, that are much less expensive and can be adapted. In this video, Chung Dha shows us an inexpensive $100 cart and how he modifies it for his needs.