Most vinyl cutters can use a pen as well. I have a Graphtec CE5000-40 cutter with a 15" wide bed, and I have adapters so I can stick sharpies of various sizes in it. Plus it has niceties like a USB interface and plugins for Illustrator. (Downside vs. an old plotter, of course, is cost.)
EDIT: also don't forget the AxiDraw! https://shop.evilmadscientist.com/productsmenu/846