All duplicators - specifically focusing on art colleges and university design departments.
Risograph printing in the design community has exploded over the past 5-6 years. They're using the duplicator similarly to a screen printing or offset process, while avoiding the mess and clean up involved with those methods.
This usually involves them purchasing an A3 duplicator & a few additional color drums. A lot of them start by emulating a CMYK setup to start (black, fluorescent pink, yellow, and a blue). Then they'll acquire additional special edition colors as they find room in their budgets.
This is not a huge revenue opportunity for click charges since they aren't using them for school-wide print sets, but the colleges blow through their supplies since most of their output is heavy fill on 11x17 sheets and each print will be made up of 3-4 colors. Here's a sample one of the designers I work with gave me:
RISO 4-Color Print - HD Black, Metallic Gold, Fluorescent Pink, Medium Blue
Our dealership JUST got on boarded for the GD ComColors before the country went on lockdown, and still trying to work out the kinks on how to approach the higher ed market, but the duplicators are our foot in the door for these Higher Ed opportunities 