Wow, sorry to say, but now with years of Garmin ownership of Delorme, they ceased production of Delorme map accessories (thank god they still make the Gazetteer maps themselves; That could very well end someday if they determine it's not profitable enough...), and now it is impossible to find map protectors from Delorme. Truly sad. Also, Blue Ridge is not making map stuff, at least for the moment, so far as I can tell. I'm gonna speculate the demand wasn't there. Blue Ridge also appears to no longer make these awesome products:
https://forum.expeditionportal.com/threads/blue-ridge-overland-gear-review-soft-bags.117744/ .
https://www.blueridgeoverlandgear.com/collections/maps/products/map-folio-12-map-organizer
I recently ordered this Adventure Tool Company Atlas Map Case
https://adventuretoolcompany.com/product/atlas-map-case And also their Expedition Map Case
https://adventuretoolcompany.com/product/5--expedition-map-case . The Expedition which is for the smaller maps only comes in the one material; classic waxed canvas. The larger one for the Gazetteers, the Atlas Map Case, comes in multiple options, but I sprung to also get it in the classic waxed canvas. I figure if it was used for a hundred plus years, it's probably the right move. It has a strong odor as you would expect.
While I haven't put them to the test and only just unboxed them today they're clearly not junk and obviously high quality textiles and very nice. They are made in Colorado and before purchasing I spoke to a man whom I believe is the owner on the phone. I have nothing but good impressions.
I also just placed an order for the 5 pack of theses Arizona hobbies vinyl 5 pack protectors:
https://www.arizonahobbies.com/road-atlas-cover-protective-clear-vinyl.html By far the cheapest option
I may at some point try this nice Etsy lady for her various high-capacity leather Atlas storage holders: she has them in various colors and options starting at 85.00$ before tax and shipping.
https://www.etsy.com/listing/1487237767/overland-road-atlas-map-holder-a-waxed?ref=cart
I think sadly these may be the only three options left at the moment.