I've wanted a pen plotter for so long, but mainly to draw sharp geometrical figures. I don't think this would scratch the itch but I'm hopeful something will appear for <$100
I would recommend a Cricut machine. Far less maintenance and everyone in the family can use.
Don't buy a Cricut. They are an insanely shitty company. The Oracle of vinyl cutting.
Get a Graphtec Silhouette Portrait 3. £180 and you can use open source software with it.