A digital duplicator might just fit the bill. No, these are not the same duplicators as the ones you used in grade school, with their purple ink and headache-inducing vapors. With a digital duplicator, you create a master of the document to be copied and wrap it around a print cylinder.
Digital duplicators are ideal for large runs of single copies.
Your only consumables consist of ink and masters. Often, businesses that purchase duplicators will do so in tandem with a copier or to complement their existing copiers. Digital duplicators can also print in color. Changing color takes as little as 20 seconds. If most of your copying consists of reasonably small runs of copies or one-off single copies, don't bother considering a digital duplicator because you won't get the value out of it.