A regular office-sized floor mat would have been too big for my home office. So I bought a transparent auto floor mat from the dollar store, and put it lengthwise over the carpet for my rolling desk chair. It works fine.
By pam munro from LA, CA
This is a page about making an office chair mat. Your office chair may require a mat either to protect the flooring or because it does not roll on carpet. Either way you can make your own and not have to purchase an expensive one at the store.