I just saw this local news item about a portable cold cap that chemo patients can rent and take home. Although it's less expensive than existing cold caps, it's still pricey but Medicare may cover the cost. Looks interesting.
New cold cap can save chemotherapy patients' hair - https://www.10news.com/news/in-depth/san-diego-startup-creates-first-portable-cold-cap-to-save-chemotherapy-patients-hair