The supplies that make up the Maintenance, Repairs, and Operations (MRO) ensure that daily transactions run smoothly, maintaining the performance of administrative tasks and machinery. Either "just-in-time" or "just-in-case" inventory, MRO items comprise of everything from replacement parts for machinery to safety products for workers and cleaning products for the physical plant. Other goods that fall into this category include mechanical, plumbing or electrical devices, as well as hardware, tools and paints, adhesives, and sealants. While each product has its own environmental considerations, following the below guidelines and environmental labels can assist with making sustainable purchasing decisions.

For paints, janitorial products, motor lubricants, lighting, and antifreeze, refer to the individual category guide for each commodity.