I've just received a very limited print run of this giant megadungeon map by Charley Phipps. The prints are B1 sized (1000 x 707mm 39.4 x 27.8 inches) and printed on matt white paper. I've added some of them to my site (see link below) and I'll be taking the rest with me to Dragonmeet in December.
https://squarehex.myshopify.com/collections/posters