Scale matters a lot. e-ink form factors that are used in consumer products have gotten much cheaper.

The smaller 2-3 inch ones (like what some stores use for their pricetags) are only a few dollars. You can find tablet sized displays for ~50 dollars. I eink is often the best choice, especially if you care about power consumption (like a hobbyist project on batteries) and a less obnoxious aesthetic (backlights in dark rooms are annoying).