If for some reason you just happen to stick with the pen, I purchased this case for travel with my Remarkable or leverage another case for iPad. I’ve had my remarkable since preorder back in 2020 and I have never lost my marker plus, or fall on the floor and break. I always carry it with my hand covering the marker. To be on the safe side though based on others feedback I purchased this case designed for the remarkable. He had to customize the size to fit the Type Folio. I have two other pens as backup as well - The Lamy and the Kaweco Al Sport from Germany (which you have to order the replacement nibs from there). Brandon Boswell got me interested in the Kaweco: https://youtu.be/Rl63SsjeP4I?si=s7QEdRjxgkSD_aZW and I do love it.
If you just want the Remarkable case, you should be able to find a reasonable priced in some cases on eBay or Mercari. Some will be overpriced but someone or whole seller is always posting the Type Folio or Book Folio for rather cheap (I’ve seen them on bid for as low as $35 and sell for that price.