A curated listing of sites selling exclusively custom map-related products such as posters, mugs, 3D maps, etc.
https://library.princeton.edu/
IIIF JPG 100% Response -
https://anvaka.github.io/peak-map/#7.68/47.727/-122.574
Custom Posters
https://www.prynd.com/citymap/
https://www.cartida.com/global/map/#
https://custom.modernmapart.com/?_ga=2.9544818.654599971.1588766584-993301045.1588766584