Your excellent article regarding office copiers for small businesses ("Copier Wars," June) touched upon, but did not adequately discuss, the matter of economical purchase of expendables such as toner and developer for the machines. The costs of these supplies are a significant percentage of the total annual cost of machine operation.

Your readers should be made aware that independent manufacturers, not affiliated with the major copy-machine companies, now produce the bulk of the developer and toner sold in the United States, and that the cost of these supplies is generally significantly lower than the supplies of the big companies. The reputable manufacturers guarantee their products, and the cost savings in using their products is impressive.