Above and below are two 12 Page 8-1/2" x 11" brochures printed using the Print-on-Demand (POD) technology. In the these two examples: each 12 page copy cost $4.25 delivered in 5 days for one or a few as needed. There is never an inventory of printed pieces. Each one is printed as needed - for ONE or more but always printed when needed and only as the quantity needed then.
Of course, if you want 1,000 then you print using offset presses. But in truth, most of the time you need only a few and this is the way to go. Keep in mind, there is never any pre-printed inventory of copies. It is one or a few at a time always.